Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ff76af586359a2…

MALICIOUS

PDF

30.0 KB Created: 2020-06-02 08:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fcec7638773b7effc478d786289ae86 SHA-1: 792c09db873bdeb1fe0f32f57e2403206ff728b7 SHA-256: 42ff76af586359a288893502907a496020fcf852d4b4b4d39e89751537be328d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, many pointing to domains that appear to be part of a link farm, suggesting a malicious intent to redirect users. The document body, though heavily obfuscated, contains references to a 'Chilton ford ranger repair manual' and multiple URLs, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://adsl-63-204-18-19.benefitplans.org/uploads/1/3/0/5/130550794/130550794.html#chilton+ford+ranger+repair+manual
    • http://youandimproved.co.uk/uploads/1/3/0/4/130488451/94aeb58eb9f.pdf
    • http://rvgconstruction.com/uploads/1/3/0/6/130620928/pejejoraforogeru.pdf
    • http://burmizpah.com/uploads/1/3/0/4/130436014/2670783.pdf
    • http://adsl-63-204-18-19.benefitplans.org/uploads/1/3/0/5/130550794/terms.html
    • http://adsl-63-204-18-19.benefitplans.org/uploads/1/3/0/5/130550794/dmca.html
    • http://adsl-63-204-18-19.benefitplans.org/uploads/1/3/0/5/130550794/policy.html
    • https://raxoxatubu.files.wordpress.com/2020/05/niniruzododasowa.pdf
    • https://samuwuv.files.wordpress.com/2020/05/xaneminadulipob.pdf
    • https://vigoxijabulo.files.wordpress.com/2020/06/jexafavuji.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_off00004a4c.bin
4029c3b150520c65e6d4f080db3c0273f97075dfa00fb45e7389a9c09f2958e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A4C 10172 bytes

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