Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a034c907ba155a…

MALICIOUS

PDF

35.9 KB Created: 2020-05-11 00:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 87cde7c127c51fc41db85e932a4e8b8a SHA-1: 7eb8395ac0edce30dd4539020e6379cd6b483d87 SHA-256: 17a034c907ba155a0eafb1daafa44057df8d7f4619765fb8eda0144e7953bacb
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically disguised as an 'Aetna claim form pharmacy' to encourage clicks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated PDF links, suggesting a tactic to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, likely to redirect users to further compromised sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://klokkeraadgivning.com/uploads/1/3/1/3/131379183/131379183.html#aetna+claim+form+pharmacy
    • http://jmcconchie.com/uploads/1/3/1/3/131380627/xujewogezasufibabubu.pdf
    • http://allseasoncomfortllc.com/uploads/1/3/0/7/130738997/c627fb5e99b94.pdf
    • http://theetrendingtopic.com/uploads/1/3/0/8/130873736/relakokisem.pdf
    • http://cuscuzetapioca.com/uploads/1/3/1/6/131607404/pefakudujo.pdf
    • http://hairlikemehaircare.com/uploads/1/3/0/6/130621105/4ad7d0a68.pdf
    • http://piccellstudio.com/uploads/1/3/0/7/130775203/94e19847.pdf
    • http://figmation.com/uploads/1/3/0/8/130814070/5558cc1076.pdf
    • http://revita-cellula.com/uploads/1/3/0/6/130604536/e44ff9575f865c.pdf
    • http://loveyrbeauty.com/uploads/1/3/1/4/131454316/rabamufag-wakoriketumaxax-varesozanafefaz.pdf
    • http://cretanoliveoilfarm.gr/uploads/1/3/1/3/131383848/ddca446ee0.pdf
    • http://earthworks-ri.com/uploads/1/3/0/3/130323767/968156.pdf
    • http://genxyzlive.com/uploads/1/3/1/1/131163590/veretinakovise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fcf.bin
75029ee409d5b348ec48c84b462293489ec5bb439030b3817cc5e4bbd330ec19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCF 11172 bytes

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