Malicious PDF — malware analysis report

Static analysis result for SHA-256 d771ee695d5fda75…

MALICIOUS

PDF

73.2 KB Created: 2021-06-12 09:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d1c760c6eb91cacf74879e391f4a6d1 SHA-1: d73f0c93ee6083998358fab2e0297cab2ba99a45 SHA-256: d771ee695d5fda75d795190f07e197349dcb66d3055ec01fd89f0ad3461c4a6d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting services like Weebly, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The document body is heavily obfuscated and appears to contain junk data rather than legitimate content, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://archism.ru/pbw?utm_term=iae+v2500+manual
    • https://jexurelo.weebly.com/uploads/1/3/4/8/134853401/3825904.pdf
    • https://fuvodaxe.weebly.com/uploads/1/3/1/3/131379021/ca4dd042f4faf.pdf
    • https://mijeridofuba.weebly.com/uploads/1/3/4/6/134677835/2005851.pdf
    • https://taruwimogepumo.weebly.com/uploads/1/3/4/3/134331568/e76937578.pdf
    • https://pejexiguwela.weebly.com/uploads/1/3/1/1/131164442/pibetapeva_pirixagofu.pdf
    • https://webutukokixomuw.weebly.com/uploads/1/3/5/3/135317122/tilitufi_xokosijipe_kukebasekopa_sedetedon.pdf
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/tifavofat_doger.pdf
    • https://linepapimufuto.weebly.com/uploads/1/3/1/6/131637640/12c6b89c0b24c6f.pdf
    • https://noruvejepemapab.weebly.com/uploads/1/3/4/7/134702548/munekire-lalasijaxufej-liwetosite.pdf
    • https://nidozasa.weebly.com/uploads/1/3/4/6/134680612/retuz.pdf
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/gejepaxu-fikulemezoweve-xodon.pdf
    • https://nuwebobejope.weebly.com/uploads/1/3/1/4/131407692/libokonew_ratobisamu_siwep.pdf
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/08af1cd.pdf
    • https://static.s123-cdn-static.com/uploads/4374835/normal_60068f3849ed2.pdf
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/7208070.pdf
    • https://cdn-cms.f-static.net/uploads/4421468/normal_60badf4a38ab6.pdf
    • https://sububavujowiv.weebly.com/uploads/1/3/4/4/134460245/lavowexaxilomog-pilosarusev-jonikefunoka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sekodegaxex.pbworks.com/f/86841156823.pdf
    • http://nugurafuge.pbworks.com/w/file/fetch/144520827/12470173083.pdf
    • http://kedajawi.pbworks.com/f/47399136275.pdf
    • http://lodenapokot.pbworks.com/w/file/fetch/144981768/stick_war_unlimited.pdf
    • http://zipiwume.pbworks.com/w/file/fetch/144538638/basic_accounting_concepts_book.pdf
    • 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_off0000e21e.bin
e2f59d38195e7a80df2f998dbd7c07baadcea16e62f9364361dc585270ff07f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 4952 bytes
font_01_sfnt_off0000f2f6.bin
0a749f9a14b781ef012278136f98af9cd03318dab7846e019a6c72cb966a5cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 10352 bytes

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