Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45827f16a9d0c9a…

MALICIOUS

PDF

29.6 KB Created: 2020-04-16 23:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1dc29a088f85ce425bd8f09a4e99da36 SHA-1: e02fac2e1e2ed31e5a53a7b9a1ad0a29267f7b12 SHA-256: a45827f16a9d0c9aa358a47d5410993d59358f38cf4ed7b8c8eee5b6fff308a6
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1598 TTPs: Gather Victim Identity Information T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are numerically or generically named and hosted on unrelated domains, indicating a link farm or SEO spam tactic. The document body mentions 'Between dates google sheets' and includes the wkhtmltopdf generator, suggesting a deceptive lure to potentially malicious or spam content. The ML classifier strongly flagged this PDF as malicious.

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://birchhillmanhasset.com/uploads/1/3/0/4/130476511/130476511.html#between+dates+google+sheets
    • http://anchortechnologies.biz/uploads/1/3/0/6/130620572/mizaluvif.pdf
    • http://testirishracehorseowners.com/uploads/1/3/1/4/131406432/norasexa.pdf
    • http://aworldelsewherebook.com/uploads/1/3/0/3/130313539/xukup-jategonasetapa-xepanopobitizo-sedole.pdf
    • http://tawecw.com/uploads/1/3/0/6/130639700/vaponotuzadeboxona.pdf
    • http://mountaintechnicalsolutions.com/uploads/1/3/0/6/130621011/05afb6e.pdf
    • http://corbincartwright.com/uploads/1/3/1/3/131380616/jesawuj.pdf
    • http://beautifulgranitellc.com/uploads/1/3/1/3/131379014/5274269.pdf
    • http://mybloomsearch.com/uploads/1/3/0/4/130489536/5787103.pdf
    • http://inspiredconferences.org/uploads/1/3/0/6/130639574/meserusalar-xunewodu-diniganabogo-doradinoputosax.pdf
    • http://mjdiagnostics.com/uploads/1/3/0/2/130289467/7977282.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_off00004d12.bin
de977ee5d07e0757196f0068b7de2ebece83da7440762c92272b0796667fd216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D12 7416 bytes

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