Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4aa04866b09fcb…

MALICIOUS

PDF

53.9 KB Created: 2020-04-24 07:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2c56dd073cb3544396820fbfc7fea33c SHA-1: 58b7d29cfeda9e9280cca08845d6bea8e8103ce9 SHA-256: 2a4aa04866b09fcbe86acdf40088242259cd7ef1b48953dc2995a7c727cae32e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO spam operation. The embedded document body text, though partially corrupted, suggests a lure related to 'Sociology a level questions and answers'. The ML classifier strongly flagged this PDF as malicious. 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://fleekstreets.com/uploads/1/3/0/7/130776423/130776423.html#sociology+a+level+questions+and+answers
    • http://skjenkinswriter.com/uploads/1/3/0/5/130540193/ruzelisona_voxazilidu.pdf
    • http://melodyxlove.org/uploads/1/3/0/7/130775102/1127588.pdf
    • http://sweetsandtreatscandybuffets.com/uploads/1/3/1/4/131407165/3020917.pdf
    • http://kreatingwithkarmen.com/uploads/1/3/0/8/130814783/novosulonexafuderoxo.pdf
    • http://fearlessfitnessllc.com/uploads/1/3/0/4/130435930/woxurofadute_fokolikife.pdf
    • http://thedarkstreet.com/uploads/1/3/0/4/130483650/joxup.pdf
    • http://artsequality.com/uploads/1/3/1/0/131069904/94ef3a69e67697.pdf
    • http://kandeboutique.com/uploads/1/3/0/5/130588459/7971429.pdf
    • http://kavanaghsport.com/uploads/1/3/0/9/130969841/2335664.pdf
    • http://lifefitnessmatters.com/uploads/1/3/1/4/131405948/zivofelo-vemaribejojuj.pdf
    • http://naomiandco.com/uploads/1/3/1/3/131379396/3347500.pdf
    • http://giftothegab.com/uploads/1/3/0/3/130323566/868e9e8aa5e2335.pdf
    • http://sweetsandtreatscandybuffets.com/uploads/1/3/1
    • 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_off0000a8b9.bin
8e7f6dc8e1f45480d295c74ea2f82ab5772b7922c4a29727724f397f8963fa1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B9 9120 bytes

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