Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2533a6feb52bc0b…

MALICIOUS

PDF

30.7 KB Created: 2020-05-25 07:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fd9b8847d5abde58e3fc51eadb74884 SHA-1: a3c0d140ce3d453798fcc8ea88038f1fd42af692 SHA-256: c2533a6feb52bc0b15fac285154588a42bbc9266060ac138bff45fcad61d8a4a
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, which are likely intended to direct users to malicious websites for downloading content. The document body explicitly mentions downloading books, reinforcing the lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://46r.undesirable.us/uploads/1/3/1/3/131380001/131380001.html#download+all+melanie+dickerson+books
    • http://petesturnings.com/uploads/1/3/1/4/131453526/5264093.pdf
    • http://travelwithpapino.com/uploads/1/3/1/3/131384359/doforolamujevuvu.pdf
    • http://airvantageuas.com/uploads/1/3/0/9/130969639/9290968.pdf
    • http://angelsministryoutreachpc.com/uploads/1/3/0/6/130621800/8fd14.pdf
    • http://rpartyfun.com/uploads/1/3/1/4/131406395/vakepusanil.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_off00004dea.bin
1c3f096de2ce9153f2ef4d90bc7f3e69c18eaf2365ac5559887896dcda4597dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DEA 10012 bytes

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