Malicious PDF — malware analysis report

Static analysis result for SHA-256 54495168e08f25ff…

MALICIOUS

PDF

37.4 KB Created: 2020-04-09 03:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cf7d065eb903c7e8bcdebd83810c7c4d SHA-1: e2397776d4d243b284e8d9216daf36287c5e2db2 SHA-256: 54495168e08f25ff168fdcda270b0afaa7dd3ece7e11aeb2dd32a284c140ad86
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spam campaign, potentially designed to distribute malicious content or manipulate search engine rankings. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://ogsglobalmg.com/uploads/1/3/1/3/131379958/131379958.html#kel+tec+p3at+9+round+magazine
    • http://threepeaksfarm.com/uploads/1/3/0/7/130776672/ca67b.pdf
    • http://ktkteam.com/uploads/1/3/0/4/130477083/264d382a9cd.pdf
    • http://michaelandmichelangelo.com/uploads/1/3/0/5/130589444/016deef6ba0c.pdf
    • http://hibernianbpo.com/uploads/1/3/0/2/130289809/c62a94e3613a.pdf
    • http://newcovenantinspections.com/uploads/1/3/0/5/130589998/maxipigig.pdf
    • http://prefacioclothing.com/uploads/1/3/0/5/130590224/3eeb71647db.pdf
    • http://qdranch.com/uploads/1/3/1/4/131411150/seludasiwutinile.pdf
    • http://prolawnstally.com/uploads/1/3/0/6/130620649/e5ae9e34c5c.pdf
    • http://dekastanje.org/uploads/1/3/0/4/130477036/tofeda.pdf
    • http://limostlouis.org/uploads/1/3/1/1/131163983/xipaj.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_off000066bc.bin
fa50a1ab081ebee5a55bf14383aead0d55b8b5bdea774e589a7148f7b8006d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BC 8896 bytes

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