Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb40475b037b2337…

MALICIOUS

PDF

84.0 KB Created: 2021-04-22 21:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0b4686d62bf9fecc22c9e62a83533dda SHA-1: 1a4567bf0049e4578b592c66dcc53ebe2368c3fe SHA-256: fb40475b037b233710b1f817570cab1d920f7605880694090b7c757eed4630fe
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=equal+protection+of+the+law+clause+definition PDF link annotation
    • http://daravto18.ru/98174797237pf3e8.pdfIn PDF document text
    • http://reduslim-sito.site/majozumefudilewigu5bj1z.pdfIn PDF document text
    • http://agreevudb.rest/22914448765qyrsc.pdfIn PDF document text
    • http://skywonder.space/adorns_condensed_sans_freeeotvv.pdfIn PDF document text
    • http://lifegirls.site/wekimawosefibobiutmr.pdfIn PDF document text
    • http://yewes.fun/532510363350iije.pdfIn PDF document text
    • http://circus.market/xavebagoluguvoxiz4eun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_a49498deebc04df992b98adf67101f8f.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_dc93fecce72a48ee85aea1dc9fbf01af.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_c8f61351f8814ad398897e5cfb4aa1bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48c43e1-e96e-4e72-a7bd-b80bc913c0c5/diccionario_espaol_ingls_google_traductor_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/744ad4f0-1d08-4ac6-abdc-1f2320de1543/what_are_contra_expense_accounts.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/77123740046.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_3d8c4f1752ce46da8513dddbe015f57e.pdf?index=trueIn PDF document text
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_2e232d73bd634b9db5381f7fe56b4c90.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_c9e3580d36904e9fad8b8f32172a9488.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zurovajij/what_makes_an_ar_15_ny_compliant.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_3e8d64cd5dbc4c1fad774253b9728814.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/towakog/14730593642.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_553b628a50714e64a576497fd7a435de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/anime_battle_3_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/lizupopupuli.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_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 5416 bytes
SHA-256: 6ca2d50b4fefb8226f2a2291011d859c168f930327037f72d699ca7b6d21b956
font_01_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 10716 bytes
SHA-256: ab4878bb1623d4dbaf99191435be684d9ef3db92e84ccd6fe1a53e2b5ff28301