Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1c381467fa3809…

MALICIOUS

PDF

36.0 KB Created: 2020-03-20 14:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e6ed49a97662c0d2fe86fe266eea1920 SHA-1: 0e27a1a796538c118a90140fcd35473d522dfe13 SHA-256: 8c1c381467fa38091dd552717cd0fd02ceff944c96c4db5e630c2f98ea56b975
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. ClamAV detected this as Pdf.Dropper.Agent-9317265-0, and an ML classifier assigned a high probability of maliciousness. The document body, though partially corrupted, contains references to the URLs, indicating a deliberate attempt to direct users to external content. The primary attack pattern involves leveraging these links for further malicious activity.

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-9317265-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9317265-0
  • 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://joanc.org/uploads/1/3/0/5/130551896/130551896.html#uso+de+las+pinzas+para+bureta+en+el+laboratorio+de+quimica
    • http://host120.carmichaelnl.com/uploads/1/3/0/3/130379227/2ffdb56d8db063.pdf
    • http://spookfabriek.nl/uploads/1/3/0/5/130589002/gifonit_natotejunegox_damesoxoforu_zuxoniwa.pdf
    • http://kirkieg.com/uploads/1/3/0/5/130551310/ponoxojebuwoma.pdf
    • http://annrebecca.com/uploads/1/3/0/6/130605218/56bf0b615f512.pdf
    • http://dominikamarvel.com/uploads/1/3/0/6/130621506/baxegupimigo.pdf
    • http://magnoliaclothingco.com/uploads/1/3/0/6/130620295/koxuvuroxo.pdf
    • http://hostmaster.artephis.co.uk/uploads/1/3/0/8/130813030/vasawemulixegu.pdf
    • http://eliteeuromotors.com/uploads/1/3/0/6/130604314/dosujuvalim-mexen-xifirejurawuj.pdf
    • http://www.thalermontage.ch/uploads/1/3/0/7/130739669/kubedo.pdf
    • http://anandiandme.com/uploads/1/3/0/5/130539774/zaronalejujanodamex.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_off00006401.bin
3c716ec53eafba718860ef3ff52f865b05942f086d2ef603d5cc631f7590839a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6401 7808 bytes

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