Malicious PDF — malware analysis report

Static analysis result for SHA-256 496fb1e690d1b2d0…

MALICIOUS

PDF

44.9 KB Created: 2020-03-29 12:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0edf2ffc304706c000a5b857aca5a506 SHA-1: 1f5e670ff4e8199bdde96ff6a783ec96c0669656 SHA-256: 496fb1e690d1b2d09b8042bc45758e90bea01d25c014b7e1021c40ee594111bf
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The document body, though heavily obfuscated, contains text that appears to be a title and metadata, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent, likely to drive traffic to compromised or malicious domains.

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://corustest.devsite-1.com/uploads/1/3/0/4/130490833/130490833.html#red+scarf+girl+book+cover
    • http://professionaldocumentpreparations.com/uploads/1/3/0/5/130589054/98f847c0c9a2.pdf
    • http://indiabygrace.com/uploads/1/3/0/6/130604104/359894.pdf
    • http://texas2stepfilm.com/uploads/1/3/0/4/130488387/revufozabusaxakova.pdf
    • http://westcoastbuilder.com/uploads/1/3/0/2/130291696/raseguzukanetulode.pdf
    • http://baumannengineering.ca/uploads/1/3/0/6/130639956/8030630.pdf
    • http://greenwolfverticalfarm.com/uploads/1/3/0/5/130543087/4662517.pdf
    • http://propsychassociatesofnj.com/uploads/1/3/0/5/130588287/6922901629a8.pdf
    • http://29-rooms.com/uploads/1/3/0/6/130639891/8098030.pdf
    • http://bigcitymanagementllc.com/uploads/1/3/0/5/130589095/bokawamakaxida.pdf
    • http://mjmaintenanceltd.com/uploads/1/3/0/4/130476511/2237729.pdf
    • http://annualhotelsforum.com/uploads/1/3/0/2/130289801/79d2efc33c36a8.pdf
    • http://barbiemarie.com/uploads/1/3/1/0/131069766/d8000bd14f7b.pdf
    • http://amazons-finest.com/uploads/1/3/0/7/130775368/9169611.pdf
    • http://gnostisisme.org/uploads/1/3/0/3/130323596/50bde1a533a020.pdf
    • http://meganmann55.com/uploads/1/3/0/6/130621461/godewasi_pezomevotesu.pdf
    • http://officespaceinmarietta.com/uploads/1/3/0/4/130491075/4083899.pdf
    • http://preferredstocklosses.com/uploads/1/3/0/7/130739016/pasararasikodaroxez.pdf
    • http://coachingcreating.com/uploads/1/3/0/5/130590724/5857258.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fdb.bin
b32c4c84e407befce219dbfc88cc06d5f189e7869a9c25b778d61ab29e9198de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDB 8564 bytes
font_01_sfnt_off000090f2.bin
c6c28444bcd94379862b6cc7f8cfcdbcdaeb026857ccdb099d87626a561054a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90F2 16092 bytes

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