Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e252b004b14f045…

MALICIOUS

PDF

39.7 KB Created: 2020-03-15 11:56:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8306bd8abc25c95e1037ed6380ca313d SHA-1: ecbbe737a70e3532a60249dbcaf0d9a89422841b SHA-256: 6e252b004b14f0455552f85df0150899d00b4240e8f0384fb5f1fe65ab379c27
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links disguised as a lab report, indicating a likely SEO spam or phishing campaign. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://1lbr5v.salon225.com/uploads/1/3/0/7/130739878/130739878.html#conservation+of+momentum+and+energy+lab+report
    • http://www.sheilatrecartin.com/uploads/1/3/0/5/130551475/4598487.pdf
    • http://treasurecloudspotting.com/uploads/1/3/0/4/130489253/dowutuxenepuwiv.pdf
    • http://kimmietownsend.com/uploads/1/3/0/6/130639205/gitufumixidas.pdf
    • http://rwccontractingservices.com/uploads/1/3/0/5/130589088/7641899.pdf
    • http://mrsmorones.com/uploads/1/3/0/5/130588363/gekuxareref-japanigiw-siwulifuvivov-nesil.pdf
    • http://windsorwesley.com/uploads/1/3/0/5/130551991/dopezamaxezebe_katesifolutof_malezurobasim.pdf
    • http://nowator.eu/uploads/1/3/0/5/130545189/a838e15b77f.pdf
    • http://nhtmedia.net/uploads/1/3/0/6/130639537/tuzibulirigi.pdf
    • http://mail.klosterkeller-bremgarten.ch/uploads/1/3/0/4/130488248/58813b7eba3692.pdf
    • http://illuminated-living.com/uploads/1/3/0/6/130639883/cbbb19b2c.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_off0000730b.bin
36aeb16d17293f12966b8d7d7713c2551cf212adb28997e8d2a84a0364a28fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x730B 7972 bytes

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