Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab66697eb9f3de9…

MALICIOUS

PDF

44.0 KB Created: 2020-04-10 05:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4fa2f63de326efd10ad5f61f05f64e59 SHA-1: ef36c18688144ab556990b26d73e2a9a9b4b04de SHA-256: 7ab66697eb9f3de9239e85e53edf837f10c82551ea158cf1911cba53c5fa7100
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains a large number of external links, indicating a link farm or SEO manipulation tactic. The embedded links point to various domains, suggesting an attempt to distribute content or redirect users to potentially harmful sites. No scripts were extracted, but the sheer volume of external links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bridgestreampublishing.com/uploads/1/3/1/4/131482946/131482946.html#silaba+tonica+con+acento+prosodico
    • http://elementsbodycare.com/uploads/1/3/1/4/131437046/lofulif.pdf
    • http://lincaprimanor.com/uploads/1/3/0/6/130621511/dagovoz_vorixow_joputezuwunixin_xafaxatuj.pdf
    • http://hiflytecno.com/uploads/1/3/0/5/130551049/xeruvegigedizok_wapovot.pdf
    • http://neboair.com/uploads/1/3/0/6/130604821/2263556.pdf
    • http://featherlitegrafix.ca/uploads/1/3/0/4/130483445/a809c7acb971a.pdf
    • http://gwinspection.com/uploads/1/3/0/3/130379237/6370113.pdf
    • http://withwhitandgraceblog.com/uploads/1/3/0/6/130620769/jufumuxepax_sagelu.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006db4.bin
3307aff24b66d947f48dbb56720da303f991ed31b857e13a341466ede52cf18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB4 8596 bytes
font_01_sfnt_off00008ca5.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA5 16036 bytes

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