Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a511b198aca1df4…

MALICIOUS

PDF

30.7 KB Created: 2020-04-07 20:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1aa6bf60de3a7cf77216ce8c72f2f69b SHA-1: eebf84716461caf10bae3896f8e662a6a7a779a6 SHA-256: 8a511b198aca1df493466f86220b572fdf3947b23c6fefc6411c6ed3d6bce9d2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond the link distribution.

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://zumarock.org/uploads/1/3/0/6/130604536/130604536.html#4j+student+vue
    • http://mrs-taylor.com/uploads/1/3/0/2/130271131/sozetedaf_binibime_giduvasufel.pdf
    • http://accqmedbillingsolutions.com/uploads/1/3/0/6/130604354/ledopas.pdf
    • http://pilgrim-funds.com/uploads/1/3/0/6/130639811/jiwaru-sizufosenigis.pdf
    • http://radioquetal.org/uploads/1/3/0/4/130488547/151cc5f89bf9c.pdf
    • http://mineralbeauty.net/uploads/1/3/0/2/130291713/dukuwidenajik.pdf
    • http://chelseagirls.store/uploads/1/3/0/6/130620603/kibusap.pdf
    • http://connectingschoolstocommunity.com/uploads/1/3/1/4/131438345/2282222.pdf
    • http://wrightbusinessservices.net/uploads/1/3/0/4/130490410/3143b.pdf
    • http://elymemorialucc.com/uploads/1/3/0/7/130739782/8374634.pdf
    • http://dollenmeier.net/uploads/1/3/1/3/131379026/palef_simafalemi.pdf
    • http://themindfulsociologist.com/uploads/1/3/1/3/131384568/verisekami.pdf
    • http://akizusushi.com/uploads/1/3/0/2/130272360/5277248.pdf
    • http://tfsonorientation.com/uploads/1/3/1/3/131380969/612cdcfcfbdcb09.pdf
    • http://liderazgodocente.com/uploads/1/3/0/4/130491319/mimasiref.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_off000052ab.bin
c727df9fc668c9f123b777b9cef1e2fcac20c7a60d301bc2250a404d50a8cce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52AB 6972 bytes

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