Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc4b56b7d360c8e…

MALICIOUS

PDF

104.2 KB Created: 2021-03-13 16:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: abc25ca724bae19b43b37a2e022efaf2 SHA-1: 389b1e704c27d639a8077f0eb6d938272bc4942a SHA-256: 1fc4b56b7d360c8ebb1e7d473c36d29f45cabd0526ae81aa0feb97ea138b8547
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 0.9998

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://pelibifir.ru/award?keyword=cardiolipina+funcion+pdf PDF link annotation
    • http://hairsprof.ru/91139212589up8vg.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/jhaoeih/zivagawowizunadugu.pdfIn PDF document text
    • http://ranking-se.com/20530403270zio5e.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/fhhHxgf/control_game_cheat_codes_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/wolowivem/hiibigB/8005804736.pdfIn PDF document text
    • http://hookup682.site/16095218921k4h.pdfIn PDF document text
    • http://yarrebitteh.online/tumutdr87l.pdfIn PDF document text
    • http://mamontov-net.cc/16692054819aryv2.pdfIn PDF document text
    • http://lazadacostumercenter.com/14951647968kxirn.pdfIn PDF document text
    • https://cdn.sqhk.co/zabitokepum/z9iiEqb/amtrak_route_nyc_to_washington_dc_map.pdfIn PDF document text
    • http://phrensy.co/rising_strong_audiobook_youtubewy63j.pdfIn PDF document text
    • http://obschee.xyz/lupobixurilubudo7qonu.pdfIn PDF document text
    • http://mon-cmso.best/why_does_my_circular_saw_blade_stop_spinningucc45.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/bf7eef86-921b-4211-a980-fa2509eab230/88823895928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f1ad49-dbfe-44b5-99a7-e21668cccc32/86963952150.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001426c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426C 4876 bytes
SHA-256: 411d866b1b8d60b3c15954b249d2be9c48b70bc19bf9778f45d83bda89578cbf
font_01_sfnt_off00015315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15315 12904 bytes
SHA-256: 3d32667713350455a840fb6a56f378a4ac1dbb3ac7f923f90b6390a825e534cd
font_02_sfnt_off00017d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D1C 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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