Malicious PDF — malware analysis report

Static analysis result for SHA-256 c312a8fe6bdae7d1…

MALICIOUS

PDF

27.5 KB Created: 2020-04-29 21:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 2ec583b297102f3df22963049770da59 SHA-1: e322247a0d790ee7aa65a79f527937e9269ac32d SHA-256: c312a8fe6bdae7d14b909f75264db94876d1634dd72df07a9f52b1fd8cfdb443
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body also contains a prominent link to 'theothertd.com'. This suggests a link-farming or redirection scheme, potentially to distribute malware or conduct phishing. No scripts were extracted, limiting the analysis of direct malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://theothertd.com/uploads/1/3/1/4/131408616/131408616.html#boral+bricks+and+pavers+technical+manual PDF link annotation
    • http://zackcaparelli.com/uploads/1/3/0/6/130639573/5009535.pdfIn PDF document text
    • http://tarotlisa.com/uploads/1/3/0/7/130775748/luzibuvalumebobakigo.pdfIn PDF document text
    • http://petersondentistry.net/uploads/1/3/0/3/130379921/8869817.pdfIn PDF document text
    • http://yournextheadquarters.com/uploads/1/3/0/8/130813966/1704586.pdfIn PDF document text
    • http://hrpropertyrestoration.com/uploads/1/3/0/6/130621732/rafibe.pdfIn PDF document text
    • http://4345linder.com/uploads/1/3/0/6/130621905/8e3dfd4c8281.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_off0000443b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x443B 7384 bytes
SHA-256: 33ebf41c8a4f89a1ab60b7b489889ba09ce8d44d2f1f774770b6acdc7d7632f4

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