Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bc984ced625801…

MALICIOUS

PDF

35.3 KB Created: 2020-05-15 13:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36bcfe9e4e5f99d973ffdf239150a551 SHA-1: 05bae44c5b3ebfe5fb548c2e9c4b798167ee1298 SHA-256: c3bc984ced625801cfebd2f535a736474f842c78e90ba2623ad154080e061b8d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning attack. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a reference to a travel guide, likely a lure. No scripts were extracted from this sample.

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://beingself-centered.com/uploads/1/3/0/6/130604687/130604687.html#dodecanese+islands+travel+guide
    • http://blackrevolverproduction.com/uploads/1/3/1/3/131380836/1789951b90f6.pdf
    • http://regenerationu.com/uploads/1/3/0/5/130544132/jamelusozonap_naxasamugij_putebale.pdf
    • http://affordablepawns.com/uploads/1/3/1/4/131438345/9023db7.pdf
    • http://ashleyherd.com/uploads/1/3/0/4/130476885/famedar.pdf
    • http://siennahoney.com/uploads/1/3/0/3/130313026/309222.pdf
    • http://die-erfolgreiche-kampfkunstschule.de/uploads/1/3/1/8/131856177/wadazu.pdf
    • http://aroiithaieaterynyc.com/uploads/1/3/1/1/131164109/ed8c309575b2e.pdf
    • http://2-eaz.com/uploads/1/3/1/3/131379113/5125378.pdf
    • http://antonioalopez.com/uploads/1/3/0/7/130740443/bifonopit_putadozopo_gukuverowokutuk.pdf
    • http://continualimprovementsolutions.org/uploads/1/3/0/7/130738553/kijado-pitikopumagiw-navexuduxonejul-naxekaf.pdf
    • http://redlinerealfacts.org/uploads/1/3/0/4/130491703/c0c72.pdf
    • http://jawsuit.com/uploads/1/3/0/7/130739962/pezev-xokuxoze-velalesasew.pdf
    • http://lakesideassembly.net/uploads/1/3/0/5/130545885/jokolavuvuv_sekaxorumuwezup.pdf
    • http://perlustrate.org/uploads/1/3/1/4/131407408/1174856.pdf
    • http://omeraziz.com/uploads/1/3/0/6/130604046/8682549.pdf
    • http://angelacarleyesign.com/uploads/1/3/0/5/130539714/8d201ac181f1.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_off00005f0d.bin
b01a8ba1e52cd672522db211164b3e65d7869944a66dfb047f705f41ab4947bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0D 10260 bytes

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