Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc67ee7496e6a26…

MALICIOUS

PDF

35.5 KB Created: 2020-04-12 15:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4bb13d7122d05db339c528dd58677b9a SHA-1: 98c80c2085b8fbdfb06a21b7a0027ac8e9972a25 SHA-256: 6fc67ee7496e6a269c6d5e9b020328f36b6fb8159bb15f46bc6940b50838bbf9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, pointing to other PDF documents. This technique is often used to manipulate search engine rankings or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports this assessment.

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://sanprado.net/uploads/1/3/1/0/131071290/131071290.html#how-things-work-the-physics-of-everyday-life+6th+pdf
    • http://d-jedi.com/uploads/1/3/1/6/131606502/8164733.pdf
    • http://asrforwarding.com/uploads/1/3/0/9/130969937/3477591.pdf
    • http://jhhillllc.com/uploads/1/3/0/5/130551374/butepalutudoro-nulazetum.pdf
    • http://charmaccents.com/uploads/1/3/0/5/130539838/bodoxakalelopo-wowose-jinesapowo.pdf
    • http://jasondhays.com/uploads/1/3/1/4/131438249/6f71bb3e06c9e.pdf
    • http://journeyisthepath.com/uploads/1/3/0/6/130639474/datenenofilofatuzi.pdf
    • http://homesinkitsilano.com/uploads/1/3/0/7/130739964/wizadeb.pdf
    • http://sandiegofinchandsoftbill.com/uploads/1/3/1/3/131384305/2640840.pdf
    • http://misterh.store/uploads/1/3/0/2/130272095/8608976.pdf
    • http://thehootonline.com/uploads/1/3/0/4/130488833/3576660.pdf
    • http://codypatchell.com/uploads/1/3/0/6/130620906/kitubukogeva-nadedevapi-zinijivirul-pisuvugar.pdf
    • http://tsujiko.studio/uploads/1/3/1/4/131483020/vivikuzorix.pdf
    • http://bbmslaw.com/uploads/1/3/1/4/131407877/b0ea6.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_off00006521.bin
bbc3998f089e71c34f8c252ce659bca5decd9ecd54b3f3f7854a1ca76d01c01f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6521 7232 bytes

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