Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dd5993f4961964…

MALICIOUS

PDF

36.9 KB Created: 2020-05-30 02:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: aa1dcd71b304a3a742999d8708a625d0 SHA-1: 377d04fc8a8cd70481fb77a5bbb76ba67a55b039 SHA-256: 54dd5993f4961964336a2b275db8f79356faeb878a80aa66eb938d7c914542e0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting a coordinated effort to distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://shoesmenm1.com/uploads/1/3/1/3/131397946/131397946.html#popular+mechanics+magazine+pdf PDF link annotation
    • http://luxuryhomeclean.com/uploads/1/3/0/5/130543511/daefcae383704dd.pdfIn PDF document text
    • http://cleanpaintbooth.com/uploads/1/3/1/8/131871627/bunogijotot-wagonexafape-wudabotividobe.pdfIn PDF document text
    • http://hauload.com/uploads/1/3/0/4/130483847/vavupavujaxet.pdfIn PDF document text
    • http://explorespaceonline.com/uploads/1/3/1/6/131637365/kovuvivezujodomixu.pdfIn PDF document text
    • http://zombiebashlv.com/uploads/1/3/0/6/130620818/8daa4ea85b33.pdfIn PDF document text
    • http://greatheadma.com/uploads/1/3/0/8/130874509/banofunubitumixus.pdfIn PDF document text
    • http://sharkeypants.com/uploads/1/3/0/4/130483864/vukidenemur-jilerofubu-tozevo-nowifoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000646c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646C 10504 bytes
SHA-256: 1f35aeaccc6225cc27258a4ca31fb5bcb2744770514bb971491b678485eb494f

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