Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb81701c8288667…

MALICIOUS

PDF

35.5 KB Created: 2020-04-18 18:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d4eed5ea9497c68554876435cbdb714 SHA-1: fb29d977b427235181cea0543a45f2c11d1ece45 SHA-256: eeb81701c82886673154a40299b82150709a6926173eb8fefd0fd02f58150f3d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Dropper.Agent-9108854-0' and a high ML score. The primary function appears to be a link farm, containing numerous external URIs pointing to other PDF files hosted on various domains. This technique is often used for SEO manipulation or to distribute additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-9108854-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9108854-0
  • 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://absolutenorthwest.com/uploads/1/3/0/7/130739349/130739349.html#qualities+of+a+good+research+report+pdf
    • http://auroranuntium.com/uploads/1/3/0/4/130483895/paxexitekarepale.pdf
    • http://the5thstop.com/uploads/1/3/0/9/130969708/3410330.pdf
    • http://michealsdeckrepair.com/uploads/1/3/1/4/131453316/gixepitu.pdf
    • http://liftupsilmdown.com/uploads/1/3/0/5/130539155/werunikijirubif.pdf
    • http://nimakian.com/uploads/1/3/1/4/131437503/rakewasadojir.pdf
    • http://fireandiceproject.com/uploads/1/3/1/1/131163744/wefam.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_off000065f3.bin
63cb37f5f72d19a23ec1d17ac5b67c76b4b5f41a9d0af157227486939ec2a237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F3 7268 bytes

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