Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82842aa69bd3e20…

MALICIOUS

PDF

29.2 KB Created: 2020-04-11 03:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2a8603639bbef51b487eb75326b3aff9 SHA-1: b7eb89e9f2c60a42db535a7281e2e15fe8e1d398 SHA-256: b82842aa69bd3e206ed249ae087986323016b443f94449785f5778dd9c330f8f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO spam or to distribute malicious files. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, while partially corrupted, contains references to the URLs, reinforcing the link-farming behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://classicsouthern.net/uploads/1/3/1/6/131636570/131636570.html#lista+de+verbos+en+italiano+conjugad
    • http://notjoshnolan.com/uploads/1/3/1/3/131383760/76a1ebb16dc59da.pdf
    • http://bugbustersmichigan.com/uploads/1/3/1/0/131070458/duroxotivirekun.pdf
    • http://essentiallyyoursmonogramming.com/uploads/1/3/0/6/130604950/buridadi.pdf
    • http://kestrelais.com/uploads/1/3/0/4/130478009/kufekexijerepupepeti.pdf
    • http://itsnotaghost.com/uploads/1/3/0/4/130476766/lapixepa.pdf
    • http://shesroyaltee.com/uploads/1/3/1/3/131378779/1072985.pdf
    • http://conversionsmatter.xyz/uploads/1/3/0/2/130274343/3350298.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_off00004b06.bin
1945ea3585003606a322bf69a38c6ad28981178d46f5788303763ee5acd30d89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B06 8008 bytes

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