Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5a28729f9283db…

MALICIOUS

PDF

34.5 KB Created: 2020-04-02 21:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fba94085647771992ef50199adbe0145 SHA-1: 2531fe42520edbdc5bc0be4809239c84c12d823b SHA-256: 3c5a28729f9283db00e02977b505d251ee6a770475f67049d672361aa4573b3d
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it functions as a dropper. The document contains a large number of external links, suggesting a link farm or SEO spam tactic. The primary function appears to be redirecting users to a network of suspicious websites, as evidenced by the numerous extracted URLs. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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-8722573-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8722573-0
  • 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://print2infinitystudio.com/uploads/1/3/0/5/130551639/130551639.html#le+banquier+tome+2+pdf
    • http://kaylanicolebeauty.com/uploads/1/3/0/2/130270897/2175647.pdf
    • http://funelteacher.com/uploads/1/3/0/5/130543568/vakofizerojuvo.pdf
    • http://ricanapr.com/uploads/1/3/0/5/130588834/4239447.pdf
    • http://rslivings.com/uploads/1/3/0/6/130639124/bapiduta.pdf
    • http://buteykobreathingeducator.com/uploads/1/3/0/6/130604815/5484702.pdf
    • http://thesmokingrille.net/uploads/1/3/0/2/130291786/tajinax_pejebobef.pdf
    • http://popegoesthewedding.com/uploads/1/3/0/7/130776068/fuxiwanoledi.pdf
    • http://utility4wd.com/uploads/1/3/0/6/130620194/77c92ba.pdf
    • http://pulseplay.net/uploads/1/3/0/7/130775310/fepolol.pdf
    • http://acuityhire.com/uploads/1/3/0/6/130604209/5baf4709.pdf
    • http://amberconsultancylimited.com/uploads/1/3/0/8/130814859/manelusejex.pdf
    • http://richestornament.com/uploads/1/3/0/6/130620275/6916810.pdf
    • http://greenwichmusiclessons.com/uploads/1/3/0/5/130541552/fenelivuk_fekatelivonil_saxumigebipesok_bidaxexuta.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_off0000598c.bin
e5297ea20e441274afac0fc5eee0b05cc8ea1165bc3a30b4a86f77fcddc66a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x598C 9516 bytes

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