Malicious PDF — malware analysis report

Static analysis result for SHA-256 942c77e477cb53f6…

MALICIOUS

PDF

40.9 KB Created: 2020-04-07 23:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32dfd93c337d620bd4fa0bdbe69dc239 SHA-1: 321c6931ba96c2c46cb0fdd44bada5b9cd20f736 SHA-256: 942c77e477cb53f6b2237bb299f213172fd03f224c642a0fee6b5f0ca84d7858
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine ranking. The document body, though heavily obfuscated, contains text referencing 'Adobe photoshop free trial version 7.0', suggesting a lure to trick users into clicking on the malicious URLs. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soulfiretallinn.com/uploads/1/3/0/5/130540501/130540501.html#adobe+photoshop+free++trial+version+7.+0
    • http://lintonconstruction.com/uploads/1/3/0/4/130483202/kipuvede.pdf
    • http://mysignzup.net/uploads/1/3/0/6/130640191/2e7e57bb8e216.pdf
    • http://suna-advertising.com/uploads/1/3/0/5/130544385/zejitu.pdf
    • http://luciosergiobjjlifestyleteam.com/uploads/1/3/0/7/130738719/robugizuriku.pdf
    • http://voirin-bourgault.com/uploads/1/3/0/4/130476054/7558653.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000624c.bin
4a73deae996d1fb306d970404ab1c478d054dd2f23a3aaf46353f50147876335		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624C 7868 bytes
font_01_sfnt_off00008107.bin
1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8107 16312 bytes

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