Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d4e511b60d6e2c…

MALICIOUS

PDF

39.6 KB Created: 2020-03-07 11:37:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 01ab897d4fb87a1ec3f122fda7beb5ed SHA-1: f5541109822de7132f7dcb9ac055bf609a21ee11 SHA-256: a5d4e511b60d6e2c3fe3f78032c47e76fe1a9e4fea9ecaa3738e8d4e6d2564b9
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on domains that appear to be part of a link farm. The heuristic PDF_SEO_LINK_FARM specifically flagged this behavior. The document body, though partially corrupted, contains a title related to medical symptoms and also includes the URLs, suggesting a lure to external content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://wcd-1199sab5.mgh-r.ch/uploads/1/3/0/4/130483582/130483582.html#signs+and+symptoms+of+rheumatic+fever+in+adults
    • http://tomczykfamily.com/uploads/1/3/0/6/130603979/lipereror.pdf
    • http://www.promotenyc.org/uploads/1/3/0/4/130488198/pogeleviw.pdf
    • http://www.bestpromise.org/uploads/1/3/0/6/130621383/tafunaviterepet.pdf
    • http://softwarehabits.org/uploads/1/3/0/2/130289679/lifixegugu.pdf
    • http://tbcomputerstudiosllc.com/uploads/1/3/0/8/130814200/8995593.pdf
    • http://heavenlydao.com/uploads/1/3/0/6/130604531/276f54a.pdf
    • http://idealrustics.com/uploads/1/3/0/4/130476628/151384.pdf
    • http://school-playgroundequipment.com/uploads/1/3/0/8/130873843/d99f159.pdf
    • http://pc101.dadgifts.us/uploads/1/3/0/9/130969131/2882366.pdf
    • http://kontrabecki.info/uploads/1/3/0/4/130488924/5294344.pdf
    • http://healthydiet4you.com/uploads/1/3/0/2/130272356/4428583.pdf
    • http://weldersunion.org/uploads/1/3/0/4/130489523/zefeduvekibili.pdf
    • http://hostmaster.dezi-mal.de/uploads/1/3/0/8/130814933/mukefixitoviba.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_off000072e3.bin
a1442c3c5f575404eba54cc339cc7a715a13030b17af7bc092141cfa3333d932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E3 7736 bytes

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