Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b003a446e74166c…

MALICIOUS

PDF

37.9 KB Created: 2020-03-22 12:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f3a118929ff8ec776399bbbe62231ef7 SHA-1: 206c1f389ecb578c65e8120911b9d29f29b6c0da SHA-256: 8b003a446e74166cd715a7a9a82c251cbcc23995b8ff4970d63b0e6a9a31cb34
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to direct users to malicious sites. The heuristic PDF_SEO_LINK_FARM specifically identifies this behavior, indicating the document's primary purpose is to host and distribute these links. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of outbound links suggests a content-luring or redirection attack.

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://whitnallwire.org/uploads/1/3/0/9/130969445/130969445.html#vegetarian+air+fryer+meals
    • http://www.studioksandb.com/uploads/1/3/0/5/130551081/dusevexolejanig.pdf
    • http://navyjunkremoval.com/uploads/1/3/0/8/130874238/xudetilefovif.pdf
    • http://plussizeweddingdressny.com/uploads/1/3/0/5/130588588/6415496.pdf
    • http://opaxglobal.com/uploads/1/3/0/5/130588529/2458988.pdf
    • http://plusoneeducation.com/uploads/1/3/0/4/130483070/turin.pdf
    • http://coreducate.com/uploads/1/3/0/6/130621746/kagafajoxa-liziwo.pdf
    • http://pierrecyr.ca/uploads/1/3/0/6/130639139/nuvujusutoluberazega.pdf
    • http://1stcallrecruitment.net/uploads/1/3/0/5/130550654/c3c451862218b7.pdf
    • http://www.bughunters.eu/uploads/1/3/0/8/130813420/pololu-mugipawiselik-relanan.pdf
    • http://www.breannavinsonphotography.com/uploads/1/3/0/6/130603928/b49db5e53d758.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_off00006bab.bin
64bb6d2781310a4213e19410dbdee7770b413d7222cf573afef9937821ccfe38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAB 8236 bytes

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