Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e8f82081ccb4f3…

MALICIOUS

PDF

40.3 KB Created: 2020-03-31 02:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b3cf1994bda39fd2f07889f2a1521a2 SHA-1: 7529ea234baa37517fb84de170a74de96642c0ac SHA-256: 43e8f82081ccb4f31f5ac5c735c77289e7f7391592de8e0188265876ded7ce7f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is the mass of embedded URLs pointing to various domains, suggesting a link farm or redirection scheme.

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://stewartelectric.org/uploads/1/3/0/7/130775504/130775504.html#morals+and+dogma+1871+pdf
    • http://shapinguptheupstate.com/uploads/1/3/0/5/130588723/papunetodu-xidader.pdf
    • http://nova-hall.com/uploads/1/3/0/6/130604778/d095b2.pdf
    • http://mytravel.guide/uploads/1/3/0/2/130270740/c5066.pdf
    • http://acs-kw.com/uploads/1/3/0/5/130543418/bomeju-pigasulisiped-budeteve-sinevivanutekar.pdf
    • http://cornjournal.com/uploads/1/3/0/5/130588966/6052949.pdf
    • http://mypcda.org/uploads/1/3/1/3/131398368/pupemanana.pdf
    • http://rcwalkinchiropractic.com/uploads/1/3/0/8/130873945/lawerota.pdf
    • http://canllonga.es/uploads/1/3/0/9/130969391/nikotizo_jisasosaretepex_sozudedove_jizugukem.pdf
    • http://shifoousa.com/uploads/1/3/0/2/130272347/5604196.pdf
    • http://tastytemptationsbytia.com/uploads/1/3/0/2/130288757/7776481.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_off000072d9.bin
816eae0110b8031f372ad33d5156c57a1a264bfd70a7d9a8e050f055a3ed63f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D9 8876 bytes

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