Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a99ca888ed0cff…

MALICIOUS

PDF

78.3 KB Created: 2021-03-17 16:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7c4a19c5ef053febc5c7edcc2ed7206 SHA-1: 40eceb4f71fcd665ed93a8c3bdc876bfb7b3c62f SHA-256: f1a99ca888ed0cff1f05ec7910e22cd2d07d53bbba564c226e58d48a892293c0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://jacksth.ru/wix?keyword=ffxiv+ramuh+hard+tank+guide
    • https://vimedapajabapi.weebly.com/uploads/1/3/5/3/135309909/9dfc2f7f69b.pdf
    • http://sport-stavki.fun/lokopula39n01.pdf
    • http://daravto18.ru/cleaning_business_proposal_template_freefwypo.pdf
    • https://marajivo.weebly.com/uploads/1/3/4/8/134878422/gipevatibipisaw.pdf
    • https://cdn-cms.f-static.net/uploads/4444866/normal_6017a399e7618.pdf
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/mapod-kibajajazow-tosafazuvixiz.pdf
    • http://sumapewub.getenjoyment.net/barn_burning_by_william_faulkner.pdf
    • https://cdn-cms.f-static.net/uploads/4419644/normal_6023c9243c78c.pdf
    • https://bajusokizuz.weebly.com/uploads/1/3/4/4/134400974/abb03caf2ce9b9a.pdf
    • https://cdn-cms.f-static.net/uploads/4388165/normal_603fbaeebe87b.pdf
    • http://blacktea.space/gezimokisanerigizefoniwejr0p44.pdf
    • https://zubikuzo.weebly.com/uploads/1/3/1/4/131453486/3fb878116f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/godewumazek/the_story_of_christianity_volume_1.pdf
    • https://s3.amazonaws.com/tubukeganuji/how_do_you_describe_your_filipino_sculpture.pdf
    • http://naxesabefadufu.atwebpages.com/14495346612.pdf
    • https://s3.amazonaws.com/pukaridimupo/avengers_4_endgame_wallpaper_hd.pdf
    • https://s3.amazonaws.com/tabobujimo/how_to_get_my_private_investigator_license_in_virginia.pdf
    • https://s3.amazonaws.com/tedowafomaru/iphone_5_battery_price_original.pdf
    • https://s3.amazonaws.com/megodipewukitoj/61131715311.pdf
    • http://xekabotiwuker.atwebpages.com/fisher_paykel_fridge_filter.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df64.bin
12af62c237a2de2d6f8349d2d3121c932824a169eda16f4939d1d914a3fbf582		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 5260 bytes
font_01_sfnt_off0000f12a.bin
8beb6819dfe6624b2b6902204fecf3f60276b980f5680c6882aae8bbbb084c9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10768 bytes
font_02_sfnt_off0001166b.bin
e4ac40d1c2c2ec871283918e2d76797670b37813514d103acc0f66573ba33369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 16220 bytes

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