Malicious PDF — malware analysis report

Static analysis result for SHA-256 52979aa15fbe1e34…

MALICIOUS

PDF

43.4 KB Created: 2020-05-21 06:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc3e87468b96bac58645a7d8e1319b35 SHA-1: 862a84aad7f796a2b959fc0654a790bcd647ee6f SHA-256: 52979aa15fbe1e34c5943889c7ea1757db6444fca0dd6b9a2829a905c2716b3d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier with high confidence. It contains a large number of external links, many pointing to similarly structured URLs on different domains, indicating a potential link farm or SEO spam operation. The document body, though partially corrupted, contains references to 'Call of Cthulhu 7th edition character sheet pdf editable' and metadata from wkhtmltopdf, suggesting a lure for users searching for such documents. The primary attack pattern involves redirecting users to a vast network of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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 http://positivepsychservices.com/uploads/1/3/0/6/130621951/130621951.html#call+of+cthulhu+7th+edition+character+sheet+pdf+editable
    • http://southernspringpolo.com/uploads/1/3/1/4/131437293/xiwote.pdf
    • http://oiltycoons.com/uploads/1/3/0/8/130874583/5b79da490becbaa.pdf
    • http://flyinggranchak.com/uploads/1/3/0/5/130551386/082340498.pdf
    • http://diversity2go.org/uploads/1/3/1/6/131636906/kimetunagojataxiwofo.pdf
    • http://mariasextonphotography.com/uploads/1/3/1/3/131384708/futaf.pdf
    • http://earbuk.org/uploads/1/3/0/3/130324044/venudegudomojidi.pdf
    • http://ask-tamara.com/uploads/1/3/1/3/131398193/pipawulu_jisogujezud_kolus.pdf
    • http://jacobswellbyron.com/uploads/1/3/0/7/130776133/9036a7b78.pdf
    • http://motorcityoctane.com/uploads/1/3/1/6/131637395/1356835.pdf
    • http://littledarlingfurtreatsandmore.com/uploads/1/3/1/4/131455398/xuzamakuzejasep.pdf
    • http://wernerskaug.com/uploads/1/3/1/1/131163516/0d166d364072.pdf
    • http://starrlightimages.com/uploads/1/3/0/8/130813762/1704140.pdf
    • http://altournaments.com/uploads/1/3/1/4/131410007/240f9b56969.pdf
    • http://laysautocarwrap.com/uploads/1/3/0/5/130543383/dec87e2e68cfe62.pdf
    • http://genesistransportsolutions.com/uploads/1/3/1/4/131438268/vokonoxemose-gozuxazir.pdf
    • http://kingcashchasencorp.net/uploads/1/3/0/5/130540501/c7cb6.pdf
    • http://jadealliance.org/uploads/1/3/0/7/130740591/rofumanewutix.pdf
    • http://dentonpestpros.com/uploads/1/3/1/4/131453255/8154862.pdf
    • http://suvitinhbinhduong.com/uploads/1/3/1/4/131407388/3a4b8ab7e.pdf
    • http://wayfarewanderers.com/uploads/1/3/1/3/131382118/aba3201532b6b3f.pdf
    • http://msimarinesolutions.net/uploads/1/3/0/5/130590678/8248788.pdf
    • http://ashlandautosalesky.com/uploads/1/3/1/1/131164054/50cbc27.pdf
    • http://girlswhocodesonv.com/uploads/1/3/0/3/130313718/satawexujapaxijej.pdf
    • http://funneladdicts.com/uploads/1/3/0/4/130435955/vezufarelij.pdf
    • http://moemoneybeats.com/uploads/1/3/0/6/130639141/6229128.pdf
    • http://moemoneybeats.com/uploads/1/3/0/6/130639141/62
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ca9.bin
65e3f1d14026341e559414807602e60e55d9b712bceebe18d695591ae88d5917		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA9 10704 bytes

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