Malicious PDF — malware analysis report

Static analysis result for SHA-256 1363b007c11f1eeb…

MALICIOUS

PDF

33.7 KB Created: 2020-06-06 06:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb0331e7942a23463b45f0ac1e3a3a9f SHA-1: d3715553c5604f63be07e547a0e23da6b7cecc85 SHA-256: 1363b007c11f1eeb63861ffb41eb1f8f9afe66cda303e83899995aeac093e523
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier as malicious and contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The presence of numerous PDF links suggests a link farm or a method to obscure the true malicious destination. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://amycourtenay.com/uploads/1/3/0/4/130435690/130435690.html#farm+lessons+jab
    • http://werockdogs.com/uploads/1/3/0/6/130621325/dedewewupanon.pdf
    • http://zenwatercompany.com/uploads/1/3/0/4/130489359/df91773e.pdf
    • http://mail.smoretrails.com/uploads/1/3/1/3/131381991/dodogufibavutonutap.pdf
    • http://forums.euccommunity.com/uploads/1/3/1/3/131380899/wemumep.pdf
    • http://1fs.undesirable.us/uploads/1/3/1/8/131856949/6dc88f37016654.pdf
    • http://zunshengqipaiyouxi.br3h.com/uploads/1/3/0/7/130739113/sukajavi.pdf
    • http://tdsacanada.ca/uploads/1/3/0/6/130620736/9748491.pdf
    • http://amycourtenay.com/uploads/1/3/0/4/130435690/terms.html
    • http://amycourtenay.com/uploads/1/3/0/4/130435690/dmca.html
    • http://amycourtenay.com/uploads/1/3/0/4/130435690/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zitipon.files.wordpress.com/2020/06/degajajebebiz.pdf
    • https://lijizadurav.files.wordpress.com/2020/06/josam.pdf
    • https://ranatokoko.files.wordpress.com/2020/06/56790022423.pdf
    • https://sibikevo.files.wordpress.com/2020/06/perosole.pdf
    • https://geliwupaz.files.wordpress.com/2020/06/dokegusuduv.pdf
    • https://dajowuzun.files.wordpress.com/2020/06/wuvikifiduwiteg.pdf
    • https://lipegodubiv.files.wordpress.com/2020/06/93559188781.pdf
    • https://lotesokuru.files.wordpress.com/2020/06/40475611643.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c19.bin
0dd3497c370ef8086c85e05db843008bb725e26b862754af6cc1724fdc5c7c41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C19 9508 bytes

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