Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4c3786222b0cf3…

MALICIOUS

PDF

41.1 KB Created: 2020-04-07 20:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb07ea6b816469580eb795def511cb6b SHA-1: 346765774707565ffc027afdbb0aeb6eff37d219 SHA-256: 0f4c3786222b0cf3429d92b25c41a28768b6a65d07c56741fdd8249400b0d8e7
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, including one that masquerades as a music download link. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious intent, likely to redirect the user to a compromised site or to download further malicious content.

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://templestoweroofing.com/uploads/1/3/0/5/130551641/130551641.html#jeezy+trap+or+die+3+album+download
    • http://nusdive.com/uploads/1/3/0/6/130620213/vumosiv-guxiwagegative-tuzogix-lebejeto.pdf
    • http://mrgoebelsjs.com/uploads/1/3/0/6/130620681/kamunivalezo-sarafadibejir.pdf
    • http://mta-sts.mx.wildedgewoodworking.com/uploads/1/3/1/0/131070109/rarav.pdf
    • http://brushwithbeauty.org/uploads/1/3/0/6/130603882/6605846.pdf
    • http://quixitoshouse.com/uploads/1/3/0/6/130639304/feliwebirukupu_pamaliwufevuze_vojominudizel.pdf
    • http://petalshop.org/uploads/1/3/0/4/130435561/3de1d06a2da2f.pdf
    • http://odohertybrothers.com/uploads/1/3/0/2/130288427/e1cd113e21.pdf
    • http://chrisglover.org/uploads/1/3/1/4/131413418/78731d3.pdf
    • http://benhall.studio/uploads/1/3/0/7/130776215/c693ec89.pdf
    • http://carsonvalleycommunityfoodcloset.org/uploads/1/3/0/3/130323328/3710269.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_off00007749.bin
48cf904b5849a6a248592338a63a451cd57bd77a368f743fbdf0677f4cdb8de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7749 8568 bytes

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