Malicious PDF — malware analysis report

Static analysis result for SHA-256 569395752f4526b5…

MALICIOUS

PDF

42.8 KB Created: 2020-04-15 00:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de73f37fd0d0835fc4fe4742ded51f24 SHA-1: 6b692c0a9fea5030eddabb2faff46e579d81840a SHA-256: 569395752f4526b57d232acec6e609041da1cf6d6a8cbc99f193db11d326b220
94 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding multiple external URLs that point to other PDF documents. The document body, though heavily obfuscated, contains text related to legal acts and the wkhtmltopdf generator, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jhrpropertyltd.com/uploads/1/3/1/6/131606175/131606175.html#indian+arbitration+and+conciliation+act+pdf
    • http://monicaariasmiranda.com/uploads/1/3/0/7/130740562/mugimaba_dimutoxelik.pdf
    • http://hiringamericamarketplace.com/uploads/1/3/1/3/131380934/gosotumiwenefije.pdf
    • http://brianjross.com/uploads/1/3/1/4/131438611/mesesivi.pdf
    • http://getlocal411.com/uploads/1/3/0/4/130483820/vitakepojigewuza.pdf
    • http://jeffreygdalrymplepa.com/uploads/1/3/0/4/130483879/7481431.pdf
    • http://kei.mx/uploads/1/3/0/9/130969503/4ae2e324fc1.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_off00007e36.bin
7c63763f2cedb3b61e7da0317321caee28ec2d9cd4d9208f5b854c1d1d892cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E36 8636 bytes

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