Malicious PDF — malware analysis report

Static analysis result for SHA-256 96cb5701efcdfbc2…

MALICIOUS

PDF

60.5 KB Created: 2020-04-12 21:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1f6808a9d5bea6d6691ea8ea6ee61db3 SHA-1: 5cb5d520f889ea212b975e4164e128f835242e83 SHA-256: 96cb5701efcdfbc27bf05c93a5e102b15b369263df2e8f1f77b5baa1afc7c001
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body text, though partially corrupted, contains the phrase 'Q hacer para engordar la cara' (What to do to make the face fatter), suggesting a lure for users interested in cosmetic procedures. The PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The ML_NYX_PDF_MALICIOUS heuristic indicates a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://northwestuu.com/uploads/1/3/0/7/130775288/130775288.html#q+hacer+para+engordar+la+cara
    • http://acarpenterscarpenter.com/uploads/1/3/0/7/130776252/9962959.pdf
    • http://fireflyagencytx.com/uploads/1/3/0/4/130492441/fezux.pdf
    • http://unameitembroideryandvinyl.com/uploads/1/3/1/4/131453415/7471232.pdf
    • http://bonusbaseballtours.com/uploads/1/3/1/3/131381151/2204435.pdf
    • http://arizonasheritagehorse.org/uploads/1/3/0/7/130775088/zabubamuwinidi.pdf
    • http://wemoveitaz.com/uploads/1/3/0/4/130491488/9645278.pdf
    • http://keniecy.com/uploads/1/3/1/4/131407572/d10a34e7f690753.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_off0000c426.bin
2b10ccd6e3159d1efebec2e7f56cc3184edd0f0c3d6c340fc6227b5b407e004f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC426 9132 bytes

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