Malicious PDF — malware analysis report

Static analysis result for SHA-256 3438d50b46151f44…

MALICIOUS

PDF

85.0 KB Created: 2021-04-09 01:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 435cbd3599d6f6755769444212a6bda9 SHA-1: 9e26481dbc97fe40571ec816ecad346fcc6d3f41 SHA-256: 3438d50b46151f44b4c2732c0cbe78923df03d47b901e37f898deb3b08c26345
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one directly referencing a search query about chicken feeders, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such links. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to phishing sites or download further malware.

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://vilenefex.ru/strik?utm_term=how+to+make+a+gravity+water+feeder+for+chickens
    • https://cdn.sqhk.co/vagewovupug/INzxXid/79480210519.pdf
    • https://cdn-cms.f-static.net/uploads/4449615/normal_601b052cc966d.pdf
    • http://choosenews.space/wood_turning_lathe_for_sale_ebay88su2.pdf
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/bonew_vowofupoxuzu_zumaxivoluvo.pdf
    • http://bnl-jobs.com/why_smoke_detectors_keep_going_offyz7jf.pdf
    • https://cdn-cms.f-static.net/uploads/4365628/normal_60620a0ff27ad.pdf
    • http://afracheat3.xyz/juwabepijasoroweb7sfp9.pdf
    • http://googsnat.space/2635654811x5mcu.pdf
    • https://fakozopaximubod.weebly.com/uploads/1/3/1/4/131453484/soxezadodejil_dizijaga.pdf
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5fc74d4c53738.pdf
    • http://callup.today/ponugitokofeqtu3r.pdf
    • http://stickerrus.ru/xojegopirimeduvomkmuki.pdf
    • https://sumejuloluguwir.weebly.com/uploads/1/3/5/3/135390827/116875.pdf
    • https://cdn.sqhk.co/pabukerofo/0spjjat/toy_warehouse_sale_mississauga.pdf
    • http://psychologyrelax.xyz/vinujokabujokirarazvn2m.pdf
    • https://sakolepak.weebly.com/uploads/1/3/4/5/134588428/9125833.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f5e.bin
f26bd0fb1e2508ed6e6f8bbc4d3b9ce8baf1acd66df54e6686efb8281c5211f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 5680 bytes
font_01_sfnt_off000122a9.bin
b2c7ca479736ab6f94e9ffcec7e3901a07bdb8e91bf34b44d49af1e9ebf67dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 10480 bytes

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