Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b88690e109d1ba…

MALICIOUS

PDF

29.4 KB Created: 2020-04-30 15:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dc23c1aed8b80edfcd298d191ea3817a SHA-1: cfda125f7b07711ba01660b9112edb7efb6b020c SHA-256: c1b88690e109d1ba1e732353ff364a27572af20d664b20302505192d97ba21dd
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body text and embedded URLs suggest a lure related to 'assembly language programming examples pdf', which is likely a deceptive pretext to encourage clicks on the numerous generated links.

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://foothillsbiblefellowship.com/uploads/1/3/1/3/131384609/131384609.html#assembly+language+programming+examples+pdf
    • http://jeffgraef.com/uploads/1/3/0/5/130551749/dotolikenawoluw.pdf
    • http://partytrayz.com/uploads/1/3/0/8/130874258/xigal_wosuvorewoza_kibilawuk.pdf
    • http://jbasscollection.com/uploads/1/3/0/4/130436125/tegimafo-gagupetom-bawulol-fofijapabid.pdf
    • http://lushworxllc.com/uploads/1/3/0/5/130551214/1330021.pdf
    • http://cmranchcookbook.com/uploads/1/3/0/3/130313564/zisukubisabomu_bogamodewaso.pdf
    • http://starlightprod.com/uploads/1/3/0/7/130776659/golifomotojer.pdf
    • http://bandbcleaningservices.com/uploads/1/3/0/5/130588263/vijemifu-mudifesuzekuz-pawefajut-bezemesukeropul.pdf
    • http://lexishboutique.com/uploads/1/3/0/7/130776561/8998128.pdf
    • http://appalachianbreastfeedingservices.com/uploads/1/3/0/6/130621409/loxitibirodeluwoz.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_off00004d19.bin
cb17064eacb88098e9928972e3d2660512983294dd0ced61cfb4f98193de051b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D19 7200 bytes

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