Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7329c92d1df9bfb…

MALICIOUS

PDF

42.1 KB Created: 2020-04-13 02:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eaa8d5b38503a462156863ab0a3a20b2 SHA-1: ceb2ca536c4c1256fccfa80c24d6d753e485e959 SHA-256: b7329c92d1df9bfb43b235e8abc2d5c8a7e32486dc7513111b15e403513e447e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This suggests a link farm or a phishing campaign designed to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kaitiakisisters.com/uploads/1/3/0/7/130738487/130738487.html#taco+bell+ada+ohio
    • http://magsandpanch.com/uploads/1/3/0/8/130813059/3632108.pdf
    • http://winshipcustomworks.com/uploads/1/3/0/7/130739924/veduzinesofiz.pdf
    • http://pasionazul.net/uploads/1/3/0/5/130541677/nivuwa.pdf
    • http://amandalynnhinson.com/uploads/1/3/0/4/130435962/5761984.pdf
    • http://nbcbdessentials.com/uploads/1/3/0/2/130291489/d6f0c410.pdf
    • http://tablethis.net/uploads/1/3/0/4/130492315/dexeketesaloxafaxeru.pdf
    • http://suedavesmobilegrooming.com/uploads/1/3/1/0/131069891/gijuxoxixirum.pdf
    • http://elainesexperts.com/uploads/1/3/0/4/130435857/c9f7156742c.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_off00007923.bin
f5a61a687ee29b9f4dfc7ee896334449d2b3b0b66560cfcc3c002cd8312d928e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7923 9204 bytes

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