Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc54db018a4430d…

MALICIOUS

PDF

35.6 KB Created: 2020-04-08 23:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ad98ac8f741ab7e3c1533f5d6cac2feb SHA-1: e2b4d6471b155995a49e31845df86f4ffc12628d SHA-256: 0fc54db018a4430d5a9aee67d8354a7678d052c082b65065f87c04bc050e6738
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 uniquely named PDF files on different domains. This pattern is indicative of a link farm or SEO spam campaign. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs suggest a phishing or content redirection attempt.

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://deborahsnider.com/uploads/1/3/1/4/131438130/131438130.html#transferencia+de+calor+por+conduccion+pdf
    • http://borough18mc.com/uploads/1/3/0/7/130740123/vukafosixu.pdf
    • http://arlotrainor.com/uploads/1/3/0/7/130739211/vururutin-vurudaxoreko-gerozuzegelozez.pdf
    • http://minixclusive.com/uploads/1/3/0/6/130639275/21d9cc38b9bb84.pdf
    • http://teamdelta.net/uploads/1/3/0/7/130775277/765811944e.pdf
    • http://livinghistorysa.com/uploads/1/3/0/4/130483918/wixoguga.pdf
    • http://phantom-rust.net/uploads/1/3/0/4/130476039/edfb118.pdf
    • http://blinkbright.org/uploads/1/3/0/7/130775834/lefope-rorax-dozoka-ruvobexesoxumil.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_off000062e6.bin
eee249ef1d89822b980bbcd721cde69c45d5276ba32fea16ed73a4dbec60c360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E6 7940 bytes

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