Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd372322d18b955…

MALICIOUS

PDF

127.1 KB Created: 2021-03-13 22:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 37b6c36c7fb8ec4e79120b3cfd6783a0 SHA-1: 83d91dbbb703bb54d7ea13b18e7a649234995267 SHA-256: bfd372322d18b955639c9c2478981eb52d6aba9d07654a32437bf37f11321020
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or unknown domains, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/wix?keyword=strat+wiring+diagram+hss PDF link annotation
    • http://lojuxaga.mywebcommunity.org/how_to_program_universal_remote_to_firestick.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/adobe_acrobat_create_toolbar_acroiefavclient.dll.pdfIn PDF document text
    • https://cdn.sqhk.co/degawatoze/8tSYHjg/air_cooled_911_buyers_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/hgid8je/57184060367.pdfIn PDF document text
    • http://nitodizej.22web.org/98268049118.pdfIn PDF document text
    • https://cdn.sqhk.co/linigurep/vjgLOih/pudunepubifupobati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_604a306c57b27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_603a28f81cf86.pdfIn PDF document text
    • http://talemine.getenjoyment.net/70384573586.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/ckGieii/53951402634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niwurekatexo.atwebpages.com/17361330842.pdfIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_262dd79d0eab4770a692a6044f9d3972.pdf?index=trueIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_af22c2a07e3b4091954856e7d7c7eba5.pdf?index=trueIn PDF document text
    • http://xemigososefof.atwebpages.com/gudusedetepu.pdfIn PDF document text
    • http://jowosos.myartsonline.com/96275486390.pdfIn PDF document text
    • http://bokowatugodipi.epizy.com/an_air_standard_dual_cycle_has_a_compression_ratio_of_16.pdfIn PDF document text
    • http://dalitixusukewo.epizy.com/close_up_movies_answers.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/samsung_c460_series_waste_toner_container.pdfIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_05a57296dac34995bfca8a61180d7766.pdf?index=trueIn PDF document text
    • http://difufoj.rf.gd/2184735470.pdfIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_4ea8fcf5d274469786bde56270a31aac.pdf?index=trueIn 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_off0001b4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4D3 5404 bytes
SHA-256: 6cb6438fbfea836c2be4ada8cc44b8fa2ae3717b52eeea5acf934a8b81fcd3f0
font_01_sfnt_off0001c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C714 11768 bytes
SHA-256: 68705bd084254f707ef6f48cbca6d57d3886bb62ed4d1efd5eeeb772e7371d54

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