Malicious PDF — malware analysis report

Static analysis result for SHA-256 e972109d812b85dd…

MALICIOUS

PDF

34.3 KB Created: 2020-04-11 07:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2e2086a3ab8e67b110f0f6c42c109af SHA-1: bd523289f5a938a478cbcab3dbb55bb4ca9b74ce SHA-256: e972109d812b85dd6897d1025a801dc947cc1b597b308169517e79c44ced4db1
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to other PDF files on unrelated domains, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, mentions 'Cashew nut nutritional information', which serves as a lure to disguise the malicious intent of distributing numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cofhhe.org/uploads/1/3/0/5/130590474/130590474.html#cashew+nut+nutritional+information
    • http://www.grassrootshealthhut.com/uploads/1/3/0/3/130313070/divoxafenogabi.pdf
    • http://northwestfishingtips.com/uploads/1/3/1/4/131483197/lanunadozok.pdf
    • http://autodiscover.everyday-wines.com/uploads/1/3/0/8/130874316/fomavujeboke.pdf
    • http://pchospitalclane.com/uploads/1/3/0/4/130476339/mawipijen.pdf
    • http://africablacksoapcompany.com/uploads/1/3/0/3/130323593/5273484.pdf
    • http://patriciarobinsonart.com/uploads/1/3/1/1/131164114/femipi.pdf
    • http://percorsidarte.com/uploads/1/3/0/9/130969004/7789324.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_off0000601d.bin
39284d5d37f51819c21041e00201d85479b5b3842bc1d24157dfd1f55f3ff4ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601D 7476 bytes

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