Malicious PDF — malware analysis report

Static analysis result for SHA-256 891c1da19d2b5262…

MALICIOUS

PDF

29.7 KB Created: 2020-04-07 08:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b162e6383a1758dcb6ef924267c90e03 SHA-1: 4a020c2fa1744dc82521e1e6d73abd352f7ced06 SHA-256: 891c1da19d2b52626a1d9d82063f2b92026a8cd60613f747bcb3761a98a9b980
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, embedding a large number of external URLs. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates the presence of numerous links, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://mernineameris.com/uploads/1/3/1/4/131406686/131406686.html#mecanismos+de+patogenicidad+bacteriana+pdf
    • http://ocsioptiumcybersystemsinc.com/uploads/1/3/0/7/130775759/4614347.pdf
    • http://albertamacaron.co/uploads/1/3/1/4/131453658/gobixekitekefid_nedegogatebop.pdf
    • http://southnewtoncommunity.com/uploads/1/3/1/0/131070733/6d78c9.pdf
    • http://deeplyrootedtv.org/uploads/1/3/0/6/130621544/kukajaxujijonuk-zeketoxin.pdf
    • http://king-alexander-minecraft-java.com/uploads/1/3/0/5/130551512/kezav_miferiwisagaxir_nopetiged_suvur.pdf
    • http://pikappaphibetaxi.com/uploads/1/3/1/4/131453915/166c10c1e4.pdf
    • http://fab2parts.com/uploads/1/3/0/5/130539838/768b0c1066.pdf
    • http://sassyscraps.com.au/uploads/1/3/0/7/130775196/dolowepod_pitedojitaja_mogawoxosif.pdf
    • http://dmcclurephotography.com/uploads/1/3/0/5/130543945/mixovelig.pdf
    • http://agapekennelswhitewater.com/uploads/1/3/0/4/130488736/kefalisuleja.pdf
    • http://texasfoodguy.com/uploads/1/3/0/5/130552043/nujekexawetowifo.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004faf.bin
9d841ba631cf2cff43d55243d9bc3eda58ea29efc456d1dd6cc8d636ae044d8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAF 6424 bytes

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