Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf5ed0639b27306…

MALICIOUS

PDF

41.2 KB Created: 2020-03-29 13:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cdedc8be314e32a89dbc67418768baab SHA-1: 0672bcefa9dc174e50be9e7dacc70f8bc542d215 SHA-256: 3bf5ed0639b2730621d4acefb9c8b9d7161e952663b627c35aee17873bab205f
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, many of which are numerically or generically named and hosted on unrelated domains, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing pages.

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://adsl-63-204-18-59.benefitplans.org/uploads/1/3/0/8/130874073/130874073.html#icd+10+code+for+thoracic+epidural+abscess
    • http://livraexpress.ch/uploads/1/3/0/2/130272278/0e2387f31830f36.pdf
    • http://creativegenius2.com/uploads/1/3/0/6/130639385/42c7c2795e3.pdf
    • http://comicbrickbuilder.com/uploads/1/3/1/1/131164418/4028884.pdf
    • http://newlifeh2o.com/uploads/1/3/0/4/130483409/zagorij.pdf
    • http://paganiproperties.com/uploads/1/3/1/1/131164159/duwuwozofaxado-vajuzuguwomagid-zosatozava.pdf
    • http://dollhouseporcelain.com/uploads/1/3/0/3/130313306/1518287.pdf
    • http://makeupbybln.com/uploads/1/3/1/3/131378771/1b261.pdf
    • http://jrcconstruction.net/uploads/1/3/0/7/130740244/ridowetipiki.pdf
    • http://commonreaders.info/uploads/1/3/0/7/130775694/pedinumojafur.pdf
    • http://mogulmeadows.org/uploads/1/3/0/8/130874340/072d319cd.pdf
    • http://charleshoustonfoundation.org/uploads/1/3/0/2/130289371/zerekisa.pdf
    • http://eurekaarchi.com/uploads/1/3/0/3/130323337/93518476b29bc4.pdf
    • http://bg-closet.com/uploads/1/3/0/6/130639055/8805470.pdf
    • http://sageoaksphotography.com/uploads/1/3/0/4/130435906/dd8ffd33.pdf
    • http://hardhathomeinspection.com/uploads/1/3/0/6/130621965/rupox_xizofixurugakon.pdf
    • http://carolynmcdemus.com/uploads/1/3/0/7/130775818/7389024.pdf
    • http://kennie2signature.com/uploads/1/3/0/2/130291579/67cdaf.pdf
    • http://elli3d.com/uploads/1/3/0/6/130621847/1666861.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_off000079df.bin
d53565671f0a1f2c41fcedd741ea0afaf196a976c8095d8f7b3487fbe86650e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79DF 7512 bytes

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