Malicious PDF — malware analysis report

Static analysis result for SHA-256 2903789faf28360f…

MALICIOUS

PDF

44.4 KB Created: 2020-04-08 10:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fa4a9a22f2096bec2c3d1b029f015462 SHA-1: 96637c4034708e165ff1643bbe3b3395338be012 SHA-256: 2903789faf28360faa6e0fdfae030bd11aa5eaee38f39acc844e7e718609bdea
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO manipulation or to distribute malware. The ML classifier strongly indicated maliciousness. The document body contains garbled text but includes a reference to the primary URL, suggesting a lure to external content. No scripts were extracted, limiting the analysis of direct payload execution.

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://thehumblediary.com/uploads/1/3/0/7/130740015/130740015.html#imagenes+de+un+hombre+enamorado+y+triste
    • http://glasspictureproductions.com/uploads/1/3/0/8/130813539/bbdc04c0.pdf
    • http://chimimundo.net/uploads/1/3/0/7/130738711/56c4f720bbeb.pdf
    • http://lacertiliadragons.com/uploads/1/3/0/6/130639821/mekusi.pdf
    • http://rocketpunchrecords.com/uploads/1/3/0/5/130551727/722301.pdf
    • http://flechefrance.com/uploads/1/3/0/6/130621128/919246.pdf
    • http://shamanically.com/uploads/1/3/0/8/130814803/722860.pdf
    • http://peradabnmate.net/uploads/1/3/0/8/130813557/5966280.pdf
    • http://mansajang.org/uploads/1/3/0/4/130483492/8601925.pdf
    • http://thehclf.org/uploads/1/3/1/4/131437627/4840963.pdf
    • http://mindkeyacademy.org/uploads/1/3/1/4/131453429/ab746aa1a0dac4.pdf
    • http://chestnutmedia.com/uploads/1/3/0/6/130621588/wonif.pdf
    • http://tyfawleyart.com/uploads/1/3/0/6/130605399/3854121.pdf
    • http://trailpointfarms.com/uploads/1/3/0/5/130544494/xuxisekuluke.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a90.bin
4a406928edc2606c59e504f348e949857d2f52a9d22f11badb39fda5c9f59726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A90 8672 bytes
font_01_sfnt_off00008a00.bin
2b2990a1b0d93ccb127ca809063c73a97112235465d0a2444c3b7275124884b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A00 17400 bytes

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