Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bdc44c4169ea9f…

MALICIOUS

PDF

33.1 KB Created: 2020-04-11 15:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f11a7d1cfde3e482be6cccf98b07e508 SHA-1: 7b4ed5e3a0c818e6d23f937fdd321cf4edf93ec3 SHA-256: 71bdc44c4169ea9fa35ecfe9f82f1463ec8da84b7bae5f68d2e33d7f1e1c7cd1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, indicating a potential link farm or redirection to malicious sites. The ML classifier strongly flagged this sample as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to direct users to potentially harmful content, possibly as part of a phishing or SEO manipulation scheme.

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://tremperfamily.com/uploads/1/3/0/6/130639162/130639162.html#revisar+aceite+transmision+estandar+jetta+a4
    • http://purerockcolours.eu/uploads/1/3/0/6/130604923/mepirowunipazanixonu.pdf
    • http://casbenefits.com/uploads/1/3/1/4/131407708/85a8168fb.pdf
    • http://the-ahs.com/uploads/1/3/0/6/130605016/bifimadumifosesaxip.pdf
    • http://ultafmtn.com/uploads/1/3/1/4/131407214/29a38ee8.pdf
    • http://juliehara.com/uploads/1/3/0/6/130621258/giroxu.pdf
    • http://dinnerfitbox.com/uploads/1/3/0/4/130476594/4869404.pdf
    • http://damienlemonnier.com/uploads/1/3/0/6/130621755/jonude.pdf
    • http://seahurstpediatricsburien.com/uploads/1/3/0/6/130639267/kurupunot.pdf
    • http://edtechrevolution.com/uploads/1/3/1/4/131437362/a57a8dc496.pdf
    • http://knoxvillerealtygroup.com/uploads/1/3/0/3/130313111/galefuwixala-vimifuw-podiw-vapibosanuzizo.pdf
    • http://icancleaningservice.com/uploads/1/3/0/6/130621158/xejagofi-lemowuxi-vemoba.pdf
    • http://niacurriculum.com/uploads/1/3/0/7/130740186/7d1967e86cc9f6.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_off0000597c.bin
68525ac477619ca4e8fa9af4bd84408f6abee201a005533f07e51a9fe5255706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x597C 8444 bytes

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