Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac365bba2e7f107e…

MALICIOUS

PDF

39.0 KB Created: 2020-04-01 19:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 241df599e8bfaac6d4c6e7438345da80 SHA-1: 1e01ebbbeee41586c343a76a4416b5b3a5560286 SHA-256: ac365bba2e7f107efbadbe410a929107323a52ed118d451460e7e4bbe48e3002
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to 'Rejuveniqe oil intensive by monat' and mentions the wkhtmltopdf generator, indicating a potential lure or content stuffing tactic. The primary malicious activity appears to be the mass distribution of external links.

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://loweslake.com/uploads/1/3/0/4/130483940/130483940.html#rejuveniqe+oil+intensive+by+monat
    • http://targheebaptistchurch.com/uploads/1/3/0/6/130604147/4184102.pdf
    • http://barebonesfarm.com/uploads/1/3/0/9/130969980/6049666.pdf
    • http://dimondecor.net/uploads/1/3/0/6/130604982/8135bc0544.pdf
    • http://baileytsnewport.com/uploads/1/3/0/7/130739021/baxevoluxebavezonufo.pdf
    • http://dolledbyzaire.com/uploads/1/3/0/4/130436180/pilunopesunaniro.pdf
    • http://fafoods.com/uploads/1/3/0/8/130814293/d9814f.pdf
    • http://centrodeapoyoescolar.com/uploads/1/3/0/5/130590123/4065926.pdf
    • http://saferidertips.com/uploads/1/3/1/0/131070240/5562890.pdf
    • http://gareaureports.com/uploads/1/3/0/6/130639528/200378.pdf
    • http://stdmgmt.com/uploads/1/3/0/6/130621006/1843634.pdf
    • http://pyrgas.net/uploads/1/3/0/7/130775223/gebusizizo.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_off000069ea.bin
5df244fcdd2e91cb491293178402258c9abc6aced491b07ff9d30f998e07ec8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EA 9492 bytes

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