Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5ab23b14936c58…

MALICIOUS

PDF

51.3 KB Created: 2020-04-20 07:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9577ee1f7d6209d3ef2bbf3bafff51d4 SHA-1: cbb723ddd55b568536e59f6f5e1f895e96fec209 SHA-256: 7a5ab23b14936c58fceea8505e81cc9368c68bf5511b2f8b19989d25f1199adc
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, suggesting a link farm or SEO spam tactic. The primary URL points to a page with a song title, likely a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the PDF structure with mass external links is a known malicious pattern.

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://johnsonandsonsservices.com/uploads/1/3/1/4/131408100/131408100.html#theeratha+vilayattu+pillai+song++in+masstamilan
    • http://zadua.net/uploads/1/3/0/5/130542971/daa128a2f24ec5.pdf
    • http://709studios.com/uploads/1/3/1/4/131437655/b92ab61442.pdf
    • http://edwardecker.studio/uploads/1/3/0/6/130621865/vofutifajogufofem.pdf
    • http://edcmagnets.com/uploads/1/3/1/3/131380292/879d7c07a288.pdf
    • http://beyondimpossible.org/uploads/1/3/0/4/130435839/mebamufo-rukivojuw-rezuzav-juxegerurukuxi.pdf
    • http://mooreandhorseford.com/uploads/1/3/0/6/130621626/9199566.pdf
    • http://positivelyprego.com/uploads/1/3/0/4/130488228/6286981.pdf
    • http://myaj-gen.com/uploads/1/3/1/4/131438642/makegukifun.pdf
    • http://nextripchile.com/uploads/1/3/1/6/131636575/kegal.pdf
    • http://wispaworldwide.com/uploads/1/3/1/4/131407406/206823.pdf
    • http://thedozerguys.com/uploads/1/3/0/5/130539837/cade6b37f93e12.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ac7.bin
b9c29e681d42b12c5595dd93c9d0c95e77e2e88422de33e877d11206980c2be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC7 8552 bytes
font_01_sfnt_off0000abd2.bin
b3affdfdfee497c2d3230853582529cf395d265bfdbb8cde7d84ae9c33602211		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABD2 16036 bytes

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