Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93c049ae0d99f8b…

MALICIOUS

PDF

94.8 KB Created: 2021-05-24 13:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e4a371fe3635c45fa371901854a36c1a SHA-1: 95fa35afb605693cbc4db2c442638ddb82b61f72 SHA-256: f93c049ae0d99f8b98fe9e458177eb69f42673d4ee86e8d39b09d6f42d8a6517
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded content, though heavily obfuscated, appears to be part of a lure to drive traffic to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/strik?utm_term=download+lagu+naruto+shippuden+op+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454682/normal_6063d87f76b0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_602d287fed032.pdfIn PDF document text
    • https://wunanowadile.weebly.com/uploads/1/3/4/6/134600652/23d2dd04.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/36acc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_601525e468dd6.pdfIn PDF document text
    • https://rakumimow.weebly.com/uploads/1/3/5/9/135957304/ea4b8.pdfIn PDF document text
    • https://luxaxezasu.weebly.com/uploads/1/3/1/3/131398230/silevu-guwobegik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481852/normal_601f39aa9c86d.pdfIn PDF document text
    • https://xosizinunebazen.weebly.com/uploads/1/3/4/0/134017923/01e0b18fe93.pdfIn PDF document text
    • https://migigagabigugam.weebly.com/uploads/1/3/0/7/130775968/tivimowotilo_nematalagozi_mokaje_derifiragi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461481/normal_600a3c522ed2f.pdfIn PDF document text
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/555491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_6061471288514.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ab70ee64-a343-4fdd-92ef-67c105ba56e0/amman_devotional_video_songs_tamil_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfd923d-8d79-41af-87e0-a37fbfe6fb29/blacks_law_dictionary_definition_of_good_faith.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f31dd2-5ebd-46ff-b492-b2eeb2ed698f/nurse_manager_interview_questions_and_answers_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396bc572-42a6-43a1-9e3c-daf61a5aa193/faramoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56713ff7-886f-42df-b1a2-022f82d6a384/71408413752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba7f3e1-47de-4be3-a117-055aee3673d0/dark_souls_2_hacks_ps3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d325d3-48ec-43f0-8bbb-ddbfa092b85a/fadoserup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01bd96fc-126e-4171-9f63-947721d74fd1/dibufonizasaworiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/510f3878-aa96-4e6d-9f91-863e12f138fb/first_alert_battery_operated_carbon_monoxide_alarm_2_pack.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 6620 bytes
SHA-256: e3a0dd25224010edc36b9a39e97e94b0dfc3cfdae2099cf3ce3c052dc7959752
font_01_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 3732 bytes
SHA-256: 0a3756325bfd8864c81cd3f3d12e6f52b2e3f9142b9b3db0989c64b1a6cb1985
font_02_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 5272 bytes
SHA-256: 1df097ae28957bd1954f6e075a185ed2670107344ad7ca0176b2452a212e8677
font_03_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 2932 bytes
SHA-256: 1ea2d49cbbca1b48dc58da2ca2b6830e71fd70eb2bfda41e461e6424ef1184ce
font_04_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 14140 bytes
SHA-256: e159415d1b447f27947ad69ad8c88a02ffac48425ee274e33af740301cfc32d2
font_05_sfnt_off00014720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14720 16596 bytes
SHA-256: 9cad43327766e7c9226d04ec8184d7e771f9304007a551f5ff7e3d95e0f5fffc
font_06_sfnt_off00015dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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