Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d3fb7d59511252…

MALICIOUS

PDF

74.3 KB Created: 2021-04-05 23:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2a914beacbfba7c009a415c84f7690c5 SHA-1: d9695ecfd1e826f4d5ff5afbbcd3b3afdd530aca SHA-256: 35d3fb7d5951125283340b50a63088faa1fe9d40b1a10f0b2c3ed7a8a256cecd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL pointing to a site that appears to be part of a SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=castlevania+2+nes+manual PDF link annotation
    • http://nesakud.mypressonline.com/personal_statement_structure.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/business_ideas_in_nigeria.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/7df10f2076684f5.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/b53582e795f08.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/teori_marxisme.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/love_story_movie_2020_south_hindi_dubbed.pdfIn PDF document text
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/99d27f469d9f.pdfIn PDF document text
    • http://jonebosu.mywebcommunity.org/tegorufuvotusovum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e93d4a-948c-4aee-9561-4c75eebb4362/casio_baby_g_shock_watch_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3124f48a-efbf-46c7-ba45-97e9d9c893ad/34132681614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f3f096-4b1d-4019-9e59-dc29697e3699/what_are_the_best_car_alarms.pdfIn PDF document text
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_e973d260c1924a1986d011d344108b1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dcb916d-ea3f-48f4-99ff-bb825bb28688/sahih_bukhari_hadith_1374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4312b302-8e67-4939-b140-38f52bfdda4d/fepaguxosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2324268c-261e-4ffc-8d28-fbdb70e15347/xupugifumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23684f3c-0e65-4838-b196-43a7bf4a3c62/dell_inspiron_3520_battery_price_in_india.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_d09e575922b94e19b256ddd5d722c643.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_a290b3a1e7d242dbbf4a4b2706c163b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9875c348-11ab-4fe8-b200-696ebe682afe/fadas.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/cloudera_manager_utilization_report.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/antimicrobial_stewardship_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215d56af-0517-4da5-9dd3-c3832f45d676/nesco_pressure_cooker_manual_pc11-25.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 4832 bytes
SHA-256: 0de41b657c3797a13e2c6eed84d8a9a438baefb1b51d9787c329f8a646cbe0c5
font_01_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 11004 bytes
SHA-256: abda5f94efa9cbcac24f5e21d4fc51c04580197424b1d55a24df35c56ca944b6