Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2f34565dd99211…

MALICIOUS

PDF

134.6 KB Created: 2021-04-01 20:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2a8033352e90859f7adff87c89e752a4 SHA-1: 04d01e6486048d72d9f9d416f9f598eeef68e152 SHA-256: 4f2f34565dd99211b2363b81553e3dd7397f72bb74257be28421c0c491d4ed13
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=corintios+6+9 PDF link annotation
    • http://nedopivele.22web.org/calories_in_10_dunkin_donuts_munchkins.pdfIn PDF document text
    • https://gogesatita.weebly.com/uploads/1/3/4/3/134321397/zepogifokubi_wizubakemux_retuza_pabilozovefa.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/lavowalunusepu.pdfIn PDF document text
    • http://rakojegad.22web.org/45284132382.pdfIn PDF document text
    • https://ribekafov.weebly.com/uploads/1/3/4/7/134761657/bulabadasexoral.pdfIn PDF document text
    • https://xefigokilevugez.weebly.com/uploads/1/3/5/2/135299251/4043561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fujadabez/american_history_x_full_movie_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d94a8e9-f376-43be-b42e-657d652681cd/fosidatomiretefapopefujuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d22bb9-bdd5-4e63-b978-89c0c4baf71d/is_monster_vegan_reddit.pdfIn PDF document text
    • http://topufopotu.epizy.com/35678031825.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/7984354432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e69863-313c-4be1-b55f-d2ea9544a597/vawuvirirogupeninopaliduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1795d1ee-7a58-4a02-9519-497765bfda8e/how_to_prepare_for_hr_admin_assistant_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9bb4905-e727-420c-a5a1-f307c88f5061/el_lenguaje_del_cuerpo_julius_fast.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/38403057778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23585238-e496-494b-807f-a0a853dfb502/54348442136.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/call_of_heroes_chinese_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/suvofe.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_off0001d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D42D 4652 bytes
SHA-256: 7d5a2163896ff2d380cd18864bcb298b7a0a3cb9b23c053ec5a5e33dffe797e2
font_01_sfnt_off0001e404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E404 12508 bytes
SHA-256: c2b0ccc3418820c26450437e5b80776a1eb3b64e05a53c6fefe476c383cf29ed

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