Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1beb279dedb5e26…

MALICIOUS

PDF

75.0 KB Created: 2021-06-11 20:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 979bb598049adcdda138cd03965b30c9 SHA-1: 510264abe6023bdbee81943a1f8d5adc8a569298 SHA-256: a1beb279dedb5e260002f336ac162201e61202c249a4aed29246b813a7001585
194 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, indicating a link farm or SEO poisoning attempt. The 'SE_INVOICE_LURE' heuristic suggests a deceptive lure, and the ML classifier strongly flags it as malicious. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://druttle.ru/123?utm_term=auditing+procedures+and+techniques+pdf PDF link annotation
    • https://keninowe.weebly.com/uploads/1/3/4/6/134617270/wubiwafiv.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/rutimetajo_risozexukafaga.pdfIn PDF document text
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/8532648.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/jizabiwadowatu-nuwita.pdfIn PDF document text
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/bisejetikiw_dajad_reparavaduni_nibogigor.pdfIn PDF document text
    • https://suvedezu.weebly.com/uploads/1/3/1/3/131379937/4596659.pdfIn PDF document text
    • https://kapiluruge.weebly.com/uploads/1/3/4/6/134672566/mipotebiralisomeris.pdfIn PDF document text
    • https://nusosujorogu.weebly.com/uploads/1/3/4/5/134589145/122441.pdfIn PDF document text
    • https://jowujutaxafekul.weebly.com/uploads/1/3/5/3/135348014/soxusajaguvagem_virokewebag.pdfIn PDF document text
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/4536f20e84943a1.pdfIn PDF document text
    • https://figusemaf.weebly.com/uploads/1/3/2/6/132682639/bizaxovusuwu-sezimegip-fininaju.pdfIn PDF document text
    • https://rogofimek.weebly.com/uploads/1/3/3/9/133997266/zipidur.pdfIn PDF document text
    • https://gipuwibozomaz.weebly.com/uploads/1/3/4/8/134891778/1243261.pdfIn PDF document text
    • https://tigepofawi.weebly.com/uploads/1/3/1/0/131071288/2b684a80.pdfIn PDF document text
    • https://devomejot.weebly.com/uploads/1/3/4/4/134491467/3861629.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/d0803b60-50a8-4042-90ee-fe4f8df3796d/rival_22_quart_roaster_oven_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21bb5b50-2e3c-4bb5-b52e-4df3273ab88d/zobutaweragaxuji.pdfIn PDF document text
    • http://gibudufu.pbworks.com/w/file/fetch/144597981/codes_for_philips_universal_remote_sru3003wm_17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e5650b-3320-4017-90d9-f8502b48abef/how_much_money_earn_from_tiktok_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22db2158-06e9-401f-9c2c-127e966852ef/examen_de_telesecundaria_segundo_grado_bloque_1_contestado_2020.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/w/file/fetch/144808821/jopiwizozupuvur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3017dc3f-45ca-4714-b06b-dc4e17a6dd3d/56255659978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe5ecbf-7181-435b-baef-bedb648e0bad/wirekigemirepina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65527267-8594-40bf-8e0f-7d0f55a86a1f/how_to_start_sodastream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4792b1f8-c004-4633-a403-b6569b2e371b/how_can_you_become_a_secret_service_agent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f967bcfd-df0a-431a-9488-0f3313403207/writing_linear_equations_from_word_problems_worksheet_doc.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_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 5500 bytes
SHA-256: 58b0b28d234d592e72ac72e0a602ae3ea2aba9cbf8ddb88a0e8ce4012aaa3b25
font_01_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 9816 bytes
SHA-256: 8106f753be35618f251c5ff3edba5b3098efb88b8eee798eb2720e12ea7ab106

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