Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9816b35c155412…

MALICIOUS

PDF

92.0 KB Created: 2021-03-27 16:12:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aeefbae0f42826ded6475d952f833773 SHA-1: 109d142315549d6c161d26ad13cd61b7dfc61407 SHA-256: 3d9816b35c15541297f7d05795a1b06f34373f3b6d8f46ffbb9ba5eefc8b8305
126 Risk Score

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 0.9998

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://midufefew.ru/123?utm_term=calibration+procedure+for+measuring+equipment+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459163/normal_5fe8d8de732e0.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/lwxzTih/how_can_i_teach_online_college_courses.pdfIn PDF document text
    • http://eushopvmn.site/105295911662tut3.pdfIn PDF document text
    • http://helen-art.ru/how_fast_did_eminem_rap_godzillazsdt4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504641/normal_60055921d09bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_60516346c1b77.pdfIn PDF document text
    • http://topchambre.xyz/ralena45g38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469378/normal_5ffb0b67369bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_604666204bfba.pdfIn PDF document text
    • http://forkidsshop.online/metta_world_peace_wife_jennifer_palmaneiiq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420766/normal_5ff8d81229720.pdfIn PDF document text
    • http://zanofijufitif.22web.org/68456266796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_60167857ab5a1.pdfIn PDF document text
    • http://barberking.best/principles_of_grammar_translation_methodt8oya.pdfIn PDF document text
    • http://axecheat1.xyz/vanidodatazurapibojopent1y6.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/YPjfAo3/exploding_kittens_nsfw_cards_images.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490266/normal_5fc6b57e69cc5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://savefativiluz.epizy.com/live_wallpaper_hd_for_pc.pdfIn PDF document text
    • http://xofiketur.rf.gd/31011685848.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_off000128fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 5644 bytes
SHA-256: 64b45d05a351ca1d68a6b45f8e744553252c2ef1f1727580bd7c56671271f811
font_01_sfnt_off00013c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C05 11504 bytes
SHA-256: a8622b73aff3a852a9d4b4aa7660837261e7b23874f2c4c074d67bcd1c0478b4