Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85f16d7215045d8…

MALICIOUS

PDF

79.4 KB Created: 2021-01-24 20:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 93257e5580dd5354d744b370f16dfa09 SHA-1: ebcb54ca30a8354cb216b85df8efbd4b10f05f65 SHA-256: b85f16d7215045d8079e86549ec09dd2d6642529cfb53e65dd926125508f6071
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://trafffe.ru/123?utm_term=dungeons+and+dragons+tv+show+reboot PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420449/normal_5fdb59f4a0722.pdfIn PDF document text
    • http://lazadacostumercenter.com/hercules_roadeo_rampage_26tu405w.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/ejhhbf1/viregozivefeseriraxefuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5feb246dba7cc.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/geifvjf/21305226492.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/hfZFexZ/easy_buttercream_icing_recipe_for_cake_decorating.pdfIn PDF document text
    • http://parralax.net/nebevenokibilpg3t3.pdfIn PDF document text
    • http://help-nanny.site/best_paranormal_romance_book_series_for_adultsulffk.pdfIn PDF document text
    • http://mybestchan.online/9235668050244r2w.pdfIn PDF document text
    • http://xrootunited.com/78937183471s0xyi.pdfIn PDF document text
    • http://sqrab.top/varekoxonutamepezivp8dtm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5feea8576291e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_6006dd089bba1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383586/normal_5fe43bd77f711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382631/normal_5ff9ece6812c3.pdfIn PDF document text
    • http://datingsexchat.site/cnc_machine_feed_and_speed_calculatorip3se.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5fdc5ef4e1778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 5344 bytes
SHA-256: a8661a6171d2df458995d675153776cfdf89ded60fffd654f184d94f6827419c
font_01_sfnt_off00010c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5A 10548 bytes
SHA-256: 55c0d12705f06b563d4c6a5c8f97670c4d3342e19f23da2b2179f8addf19141f