Malicious PDF — malware analysis report

Static analysis result for SHA-256 839261078293081d…

MALICIOUS

PDF

44.5 KB Created: 2020-04-13 23:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-10-23
MD5: 440cd65c7c962e9e43dc94d88ab653fa SHA-1: 1fc8c84fcb390cb904334be8ec49fd08e4fe29b2 SHA-256: 839261078293081de11646079cf21bc2a6ff81f52b7c2fca9dc1379c6150a5f0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated PDF files or HTML pages, suggesting a link farm or SEO poisoning tactic. One embedded URL points to a page that mentions 'Camtasia 8 64 bit', potentially a lure for software downloads. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://dusd-cte.net/uploads/1/3/0/3/130313046/130313046.html#camtasia+8++64+bit PDF link annotation
    • http://zachkohlberg.com/uploads/1/3/1/4/131455543/doxexevolojaz-zeruwidej-nijavoke.pdfIn PDF document text
    • http://bgballroomdance.com/uploads/1/3/0/4/130494172/44924.pdfIn PDF document text
    • http://transfigura.net/uploads/1/3/1/4/131482832/58e610.pdfIn PDF document text
    • http://helenyeplehn.com/uploads/1/3/0/8/130873996/4b79e33.pdfIn PDF document text
    • http://aplusak.com/uploads/1/3/0/5/130551153/mulap.pdfIn PDF document text
    • http://godsgirlaccess.com/uploads/1/3/0/6/130620293/3378220.pdfIn PDF document text
    • http://perrylogisticsgroup.net/uploads/1/3/0/7/130739779/0bd962fcf01d.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8644 8416 bytes
SHA-256: 2fa94f6e7dc710299bfe3a0960875a7e6d331e29dbb0a9dc38018fab3317c4b9

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