Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef8c4563a97cbbb…

MALICIOUS

PDF

37.1 KB Created: 2020-04-02 08:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7a1ef30ba2ca79c16cc0a80355c5f364 SHA-1: a025c0eb52b2b91057b31af1fc23fd70551ac845 SHA-256: 3ef8c4563a97cbbb9d4be0ed5312f938bdf45ff911dc7b6150a863222f396eaf
62 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, many of which are dynamically generated and point to PDF files on various domains. This behavior is indicative of a link farm or SEO spam campaign, designed to drive traffic to potentially malicious sites. The document body itself is minimal and appears to be a lure, referencing a 'Stem careers worksheet 1'. No scripts were extracted from this sample, limiting the ability to determine further payload delivery or execution.

Heuristics 3

  • 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
  • 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://dylanboone.com/uploads/1/3/1/3/131398596/131398596.html#stem+careers+worksheet+1
    • http://8minsecret.com/uploads/1/3/1/0/131070447/kulopagip.pdf
    • http://wingmingexchange.com/uploads/1/3/0/5/130545382/c5d83a9b98a.pdf
    • http://hypnobirthmelbourne.net/uploads/1/3/0/7/130739121/kaxovixep_xevexomurofo.pdf
    • http://hollisterracing.com/uploads/1/3/0/6/130603721/xozadage-befupo-wuxunodon-firawit.pdf
    • http://taylorbethbland.com/uploads/1/3/0/5/130551153/f91f3.pdf
    • http://partyhusband.com/uploads/1/3/0/6/130621158/vijolatedamave.pdf
    • http://webmail.villagepharmacymiami.com/uploads/1/3/1/0/131070619/gavuratatudagi.pdf
    • http://wbsmachinery.com/uploads/1/3/0/2/130270834/8429721.pdf
    • http://topnotchtilingandrendering.com/uploads/1/3/0/6/130640057/baaadb463.pdf
    • http://niwawriters.org/uploads/1/3/0/4/130494636/kobokiroka_gobuwuxujubavu.pdf
    • http://madddss.com/uploads/1/3/0/2/130271054/xirireg.pdf
    • http://6weekstochange.com/uploads/1/3/0/5/130588288/fekonig.pdf
    • http://atuestilowomen.com/uploads/1/3/0/5/130550911/dd8a0a.pdf
    • http://ontarioresume.com/uploads/1/3/0/7/130776055/kukanuga-fabesi-gebowi-lijixu.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_off00006a40.bin
fb4d8ed394aff0981088164f8ff9b84c3419129799012b5a4124d7861b6aef6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A40 7460 bytes

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