Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb464afbc5793691…

MALICIOUS

PDF

37.5 KB Created: 2020-05-28 18:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e76976dd4fe4465afe56618e90e79dfe SHA-1: 64d6188fcd7f98b24b1ff10d84ebb83f9b4d81b9 SHA-256: bb464afbc579369179ba0a2facf9a40f40594eb99d4d3f6ced44b36dfcf8473b
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The document body itself contains garbled text and references to a book title, likely a lure. No scripts were extracted, but the extensive use of external links indicates a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://adsl-63-204-18-28.benefitplans.org/uploads/1/3/0/8/130874192/130874192.html#the+millionaire+mind+thomas+stanley+pdf
    • http://musclecarnationals.com/uploads/1/3/1/3/131383486/marivi-vunujefifut.pdf
    • http://another-place-called-home.com/uploads/1/3/0/4/130476158/3595785.pdf
    • http://frinersa.net/uploads/1/3/2/3/132302848/aae9ccda4c358.pdf
    • http://expatwellbeing.org/uploads/1/3/1/6/131636664/jedobuv_dexerosuzem_sibafa.pdf
    • http://mail.dynamicdiscovery.eu/uploads/1/3/1/6/131606198/f54d1ca16d03f.pdf
    • http://novussoftwaresolutions.com/uploads/1/3/0/4/130483202/680bb3.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_off00006600.bin
87a6692c749528e4514f5d7ed7fe76583f43a0ef4baf435865b7f48b920fc2d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6600 11348 bytes

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