Malicious PDF — malware analysis report

Static analysis result for SHA-256 624746d35b01b66e…

MALICIOUS

PDF

44.0 KB Created: 2020-06-17 00:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f39c04495bbdc34a06f60586e6627d2 SHA-1: c1514192eceec41cd8129127f9845625217d3f74 SHA-256: 624746d35b01b66efb60fadaa0f332b4b483acb6849bbd25b92856eb9db8d25e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a method to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of external links points to a deceptive or manipulative purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://tuxrentalinnashua.com/uploads/1/3/1/3/131379615/131379615.html#vector+based+pdf+photoshop
    • http://wewetees.com/uploads/1/3/0/6/130604858/leburoronugaraluwa.pdf
    • http://rivervalleyrevenge.com/uploads/1/3/0/6/130620868/1270680.pdf
    • http://bullseyebasements.com/uploads/1/3/0/3/130323400/jetodusob.pdf
    • http://webdisk.salujainsolvencysolutions.com/uploads/1/3/0/8/130874161/kuvufomer.pdf
    • http://mail.daniellelchuk.com/uploads/1/3/1/6/131606346/lasasigiwov_lasorafaze_nugekoxezizezar_fesojedozame.pdf
    • http://cookchirpracticgarland.net/uploads/1/3/1/8/131872149/sajubosud.pdf
    • http://host42.carmichaelnl.com/uploads/1/3/0/7/130739039/nadigovawekudak-lujimevaw.pdf
    • http://footmulti.com/uploads/1/3/1/6/131636855/wisewixemube_takujafimi_guwun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f6c.bin
f3fee806afa9b100758a532b0fe36171cb80d5a323d2b5d96373714c78723edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6C 4948 bytes
font_01_sfnt_off00008049.bin
49bd76b53f44c94edf3c192bdee1f8dc9bcf0aaec88b9610d7170ffbcffbed57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8049 10656 bytes

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