Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb8a9357c3146c1…

MALICIOUS

PDF

45.4 KB Created: 2020-03-27 11:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d3be3217621328685665c1d6db64c035 SHA-1: 9d75e5ea0e19b9a2137efa364126fdafb248ec80 SHA-256: 1fb8a9357c3146c105e53ac8cd9bbf73b446df456f2d891289cb7b5d0a2b6f61
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains references to 'The mummy 2008 parents guide' and authoring application details, suggesting a lure document. The primary attack pattern appears to be SEO spam or redirection to potentially malicious sites.

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://minnesotahydrographics.com/uploads/1/3/0/2/130271259/130271259.html#the+mummy+2008+parents+guide
    • http://jessicabdyoga.com/uploads/1/3/1/1/131164462/dd45f19d5.pdf
    • http://vivian-lam.com/uploads/1/3/0/7/130740222/vonolipumunuf_novufizakin_danewusixurab.pdf
    • http://www.grantsrealtyteam.com/uploads/1/3/0/6/130621703/a1719b857b312.pdf
    • http://jameshamiltonroofingandbuilding.com/uploads/1/3/0/6/130639809/07b00c.pdf
    • http://yawenyang.com/uploads/1/3/0/4/130476691/wotujimifofit-fizuwovi-madawuwi.pdf
    • http://obsidianmarkets.com/uploads/1/3/0/7/130739578/fuzofoforeti.pdf
    • http://authoretheldiggs.com/uploads/1/3/0/2/130270924/8644d39b70.pdf
    • http://parkside705.com/uploads/1/3/0/6/130639641/zotusovonipot_bejuber_sozibemefek_benuleleson.pdf
    • http://inverwrap.com/uploads/1/3/0/4/130491932/tevodesifelevuw.pdf
    • http://tea-and-qi.com/uploads/1/3/0/4/130488371/10093.pdf
    • http://tiinaholli.com/uploads/1/3/0/4/130476143/6975727.pdf
    • http://www.remaprevive.com/uploads/1/3/0/4/130489019/kurijese_tabozijuka.pdf
    • http://www.lancebellsportfolio.net/uploads/1/3/0/6/130604010/goselufi.pdf
    • http://lindseymarina.com/uploads/1/3/0/6/130620936/8637343.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_off000088ed.bin
8236193437a5f763d77def7f5525547e50226150ef66f18e04f99d10102c4b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88ED 8128 bytes

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