Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7df9ad62cdf825b…

MALICIOUS

PDF

77.4 KB Created: 2021-03-22 22:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 33ebd514dab00a15b8131b3d913c622b SHA-1: e9ef39d117b20ee7f585c5996b7b4ac56bb89c29 SHA-256: d7df9ad62cdf825b4f1e3ed995da577ce0010490c4d795e5fabdd4e27ee5b968
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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/award?keyword=pdf+bestand+verkleinen+voor+mail PDF link annotation
    • http://xoxapepagaxon.mypressonline.com/rizufikududepojutog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_5fda372865662.pdfIn PDF document text
    • http://erethiztzj.space/metformin_500_mg_side_effects_nhsp8rwy.pdfIn PDF document text
    • http://usesucre.pro/677382174410xlts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413866/normal_5fc929a37d83f.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/vubuwutituvo.pdfIn PDF document text
    • http://bewudewumit.sportsontheweb.net/xefuginejalagifoteku.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/12857302090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_60217871d3fb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fc6b54592593.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/a6e3d3b2-c41c-44cd-828e-3a4b7469aed7/88377720482.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/how_to_fix_fluval_filter.pdfIn PDF document text
    • http://dujazenemelix.epizy.com/appointment_letter_format_for_design_engineer.pdfIn PDF document text
    • http://xalanijowule.rf.gd/happy_wheels_android_google_play.pdfIn PDF document text
    • http://xuvafinuvewabek.epizy.com/48311666905.pdfIn PDF document text
    • http://roluvad.epizy.com/72029392074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3411eda9-f7ed-462b-9d7c-1aea5bd50bf3/how_to_heal_gums_after_dental_surgery.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/89698762461.pdfIn PDF document text
    • http://vovakupalujum.onlinewebshop.net/14281475293.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/the_standard_insurance_dental_provider_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27474c3d-596b-465d-b04d-28fe2b37ad31/jain_and_mathur_world_history_book_free_download.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_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 5320 bytes
SHA-256: c18d5911bef44f3810820c9bf68d039bdb797209437c4b104f38938178de8444
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 11344 bytes
SHA-256: 4d344ea3dd728f19f0c505aebfa1cddfefe5889a8473448e724dd2ddf938a89d

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