Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a7ddc1d9d36342…

MALICIOUS

PDF

44.0 KB Created: 2020-03-30 07:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2e50c00977f4876eb0498db9993fa10c SHA-1: 0a9f9fce65cd36016743b9ff9b23d1176288d26d SHA-256: f8a7ddc1d9d363423b1ee8976ca5505bb40707c35130be4b403696197d601faf
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common technique for SEO spam and phishing lures. The document body, though partially corrupted, suggests a lure related to 'Smile Charlie Chaplin lyrics and chords'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially malicious content hosted on the numerous external 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://sta-66-99-58-208.ladse.org/uploads/1/3/1/4/131408017/131408017.html#smile+charlie+chaplin+lyrics+and+chords
    • http://xclusiv.com/uploads/1/3/0/8/130873976/eed9b6.pdf
    • http://rufus.pdp.fi/uploads/1/3/0/7/130739661/7122544.pdf
    • http://handzfilbestcuisine.com/uploads/1/3/0/5/130539457/404e252428abc.pdf
    • http://onshoringphilippines.com/uploads/1/3/0/7/130776587/wovatojog.pdf
    • http://locustvalleylocksmith.com/uploads/1/3/0/2/130274146/2472185.pdf
    • http://radiomci.com/uploads/1/3/1/1/131163761/jolemoverokin-kefox-sumewaw.pdf
    • http://robertlarnold.org/uploads/1/3/1/1/131163959/zutivagenukomal_lesavewama.pdf
    • http://homeinspectionrepair.org/uploads/1/3/0/3/130323888/jetoruxez.pdf
    • http://liberalative.com/uploads/1/3/0/5/130539759/4478e38.pdf
    • http://madelocalmelbourne.com/uploads/1/3/0/3/130379226/zoxafoxodedive_jizemubitojitet.pdf
    • http://gulfcoastcitychurch.org/uploads/1/3/0/8/130873833/patuvilerenajut.pdf
    • http://scolaw.us/uploads/1/3/0/7/130740202/9227336.pdf
    • http://toughknots.com/uploads/1/3/0/4/130483109/26119711.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_off00008341.bin
2892ff9d98c7d55a4756410203b838a4564f1ad6fd95bf4265793e90757b6c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8341 8284 bytes

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