Malicious PDF — malware analysis report

Static analysis result for SHA-256 607063171fb1c443…

MALICIOUS

PDF

36.6 KB Created: 2020-04-14 11:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15895c89fe8bb639d29ac6a960209e83 SHA-1: 53322777bff9b70e767f5683d7ad010db11fb5e7 SHA-256: 607063171fb1c443d473dcd7ad08671acad21f91e44f6a0b5d1ca35f584c7772
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to various websites. The document body, though heavily obfuscated, contains text related to 'Facebook app all photos' and references wkhtmltopdf, indicating a potential lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://amazonusedapplianceparts.com/uploads/1/3/0/2/130274097/130274097.html#facebook+app++all+photos
    • http://mulherinfoundation.org/uploads/1/3/0/5/130588751/tewelov.pdf
    • http://ollingdevotions.com/uploads/1/3/0/5/130589098/6200572.pdf
    • http://paddlebythepark.com/uploads/1/3/0/5/130590030/paweke.pdf
    • http://eloyjrojas.com/uploads/1/3/0/5/130545365/dazogawogibe-woxef-tadikujovaz.pdf
    • http://sirenpictures.com/uploads/1/3/0/3/130323103/d40ba37408b79.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_off00006806.bin
5ccb99e5f08d5567e0bcc5b9ab07ed9e7255ce9723424c8b29d8e5270bccbe5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6806 8440 bytes

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