Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8634132512b089d…

MALICIOUS

PDF

77.8 KB Created: 2021-06-06 16:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2dac0f3432bd18be45b54cd7b4135098 SHA-1: 69718d4ba05e7032ee3979eecc71b41a3b64bde9 SHA-256: c8634132512b089df30ab86aec61457d77f115f0ac54bf12961aa20b314153e9
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to downloading software, which, combined with the numerous external links, points towards a lure for potentially unwanted software or phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/pbw?utm_term=descargar+corel+draw+x7+gratis+para+siempre PDF link annotation
    • https://koxepapo.weebly.com/uploads/1/3/3/9/133997229/xotobologeneno-tusax.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/2622822.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/jaluretezirexiv_tifojuxiwotaga.pdfIn PDF document text
    • https://loponulofaxoli.weebly.com/uploads/1/3/4/3/134324484/06b2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144424116/plantilla_libro_diario_para_imprimir.pdfIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144711348/coulombs_law_problems_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216a80ab-8701-4214-b746-21a8b4d0d44e/84163706378.pdfIn PDF document text
    • http://vazesuna.pbworks.com/w/file/fetch/144500538/bihar_stet_maths_question_paper_2011_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a65565-9cff-40e9-9c2d-d022dcb7de28/biwosalagitizinumopasezos.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/f/29097393249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c637be63-ac09-4ee5-b83e-52bbeaa2f98f/fuxesevatudul.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/w/file/fetch/144424422/how_to_do_a_back_handspring_tc2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22dd476-1fd9-44c4-99f1-1876703be74f/liduluvasejupibudag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7e3ec2-c736-40fb-a663-f739e368c07a/gbwhatsapp_delta_apk_download_latest_v1_1.1_in_2019_-_apkfolks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c534f98-5f75-4bbc-8e7d-02a75d6355fb/bimegaligifira.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/f/mosejetolezetunopus.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144427536/45912688179.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144420657/92781492534.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/f/what_the_12_steps_of_aa_mean.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144573537/afrikaans_short_stories_for_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/813a3368-2bc0-471e-9b5d-baf01fe90538/how_to_take_apart_a_kitchenaid_artisan_mixer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cabc656b-6af0-4f98-9769-55ca9cf2d3a6/29760900347.pdfIn PDF document text
    • http://zuvuwiro.pbworks.com/w/file/fetch/144703698/how_to_make_a_motorized_go_kart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c39002a-2704-4520-b54c-332b25b69567/48250527208.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_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 5632 bytes
SHA-256: dc0390e50500d8d7fe593d65231192f4b1f6ef7074a924cb60a9c28ea195ef81
font_01_sfnt_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 11692 bytes
SHA-256: 20dc96aeadb430ae8d067da2e45b5e1e0eb27f617d7e92303026a167dc5aad30