Malicious PDF — malware analysis report

Static analysis result for SHA-256 a513010db57ce109…

MALICIOUS

PDF

33.8 KB Created: 2020-04-26 01:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e122e1b1a762ce3895408b180fe3f899 SHA-1: 55628663c5a1e9b8e75201a6d68aae6b98f333b6 SHA-256: a513010db57ce1097cc27c07731004af6650ec7ccb14a858a00e9f3d50e8522d
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'completing the square worksheet kuta software' and embedded URLs, reinforcing the lure to external sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://americanfiberglasspoolcompany.com/uploads/1/3/1/1/131164319/131164319.html#completing+the+square+worksheet+kuta+software
    • http://hkamarillolaw.com/uploads/1/3/1/4/131452954/604ff2a5fd133.pdf
    • http://johnaherman.com/uploads/1/3/1/0/131070342/kevogazodiver.pdf
    • http://dirtytruckgear.com/uploads/1/3/1/4/131406455/9935835.pdf
    • http://designonrails.com/uploads/1/3/0/2/130273850/vikawipabanidirik.pdf
    • http://driftwoodartdesign.com/uploads/1/3/1/3/131398605/c6336c8bc900e.pdf
    • http://theblockhousecafe.com/uploads/1/3/0/7/130775211/xaxeroladumovigaxume.pdf
    • http://grubbinwithgreg.com/uploads/1/3/0/6/130640126/judotofap.pdf
    • http://duncanwaldron.com/uploads/1/3/0/7/130739508/gavedov-motaxolafifesob.pdf
    • http://investinorangecounty.com/uploads/1/3/0/7/130738979/xiwopu-zexanojimusixa-tolesepufoxi-nadaba.pdf
    • http://investinorangecounty.com/uploads/1/3/0/7/130738979/xiwopu-zexanojimusixa-tolesepufoxi-n
    • http://lationsandtech.berkeley.edu/uploads/1/3/1/1/131164472/abe3448ffbb0ee.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_off000059bb.bin
83c66a68c7d2487506c9e82941b957d1b3c273042ee14625066214994b7d2c99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59BB 8104 bytes

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