Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4eb4377a500b95…

MALICIOUS

PDF

37.8 KB Created: 2020-06-20 22:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c70911c902142d834ae162f307af9622 SHA-1: 2ff7ba8385fa0995b07b60b5a5fd51da81747532 SHA-256: 4d4eb4377a500b954fc56212f4cc55cb69f1f633a8acbab004274999ae7a2f92
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. The document body text, though partially obfuscated, includes the phrase 'Auto mechanic manual pdf' and several URLs, reinforcing the lure. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent.

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://velocityofbusiness.com/uploads/1/3/0/5/130542972/130542972.html#auto+mechanic+manual+pdf
    • http://1vu.undesirable.us/uploads/1/3/0/2/130289628/sewofis_narijamata_talug_budavutipug.pdf
    • http://dobikeplan.com/uploads/1/3/0/2/130291662/7734585.pdf
    • http://mta-sts.olgarocklin.com/uploads/1/3/1/4/131437457/1895034.pdf
    • http://didditt.net/uploads/1/3/0/7/130739786/zefuxoge-wipubakuxinir-jivila-nupuguz.pdf
    • http://michaelkitzes.com/uploads/1/3/1/4/131410736/246c42a486787.pdf
    • http://mail.clintvaughttattoos.com/uploads/1/3/0/6/130620958/7160a7ceee14bb.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_off000054c0.bin
84fcf38bdb4c3a0ecc95de1362f931a5efff897d532bfbc880411db47fdda831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C0 4992 bytes
font_01_sfnt_off00006598.bin
4751bbd1d597aa352037a69d2ffdc55d2cdb29bb7972b294c122883369091088		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6598 11076 bytes

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