Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef35f7f618d2b82…

MALICIOUS

PDF

37.9 KB Created: 2020-04-03 21:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ce89c86a08d2de2536a220457f5d6d5c SHA-1: 2ecf1f8dd53877086f32a427d6a5fa361f86bd12 SHA-256: 3ef35f7f618d2b82b82a1a6dfe78d8f96f22dc1210aac1e0029c7334801d754d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file exhibits characteristics of a link farm or SEO spam, with a large number of embedded external URLs pointing to other PDF files. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links suggests an attempt to direct users to potentially harmful content or to manipulate search engine rankings. The document body contains a deceptive title and metadata, further supporting 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://vectorhomeservices.com/uploads/1/3/1/3/131398015/131398015.html#the+unbearable+lightness+of+being+meaning
    • http://charlienicoles.com/uploads/1/3/0/9/130968912/xobofafen-gewusabob-vegije.pdf
    • http://kentwaterstables.com/uploads/1/3/1/4/131453086/tefitoxujurosemox.pdf
    • http://infomundototal.com/uploads/1/3/0/6/130621279/vegak.pdf
    • http://mhdodgebrawl.com/uploads/1/3/1/0/131070498/dagaku.pdf
    • http://brismakingchanges.com/uploads/1/3/0/5/130588443/jejetoxewuka.pdf
    • http://creativeplayschool.net/uploads/1/3/1/4/131413550/danuzojitob.pdf
    • http://vn-thutucnhantien.online/uploads/1/3/1/3/131379789/1260534.pdf
    • http://travelmayariviera.com/uploads/1/3/0/6/130621530/18adff6310744d.pdf
    • http://zirwas.com/uploads/1/3/0/4/130490328/7602535.pdf
    • http://willowcricketshack.com/uploads/1/3/0/4/130478433/zakatokusavu.pdf
    • http://interstatefive.net/uploads/1/3/1/3/131379389/zapidegatataxomodo.pdf
    • http://odonatahealthwellness.com/uploads/1/3/0/3/130323908/9647436.pdf
    • http://nashvillefacepainter.com/uploads/1/3/1/4/131452846/munavonurunefazupel.pdf
    • http://metamobilerepairandservice.com/uploads/1/3/0/6/130604026/382e72.pdf
    • http://bloominbrilliantdesign.com/uploads/1/3/1/4/131437349/fulura-vumedegitomi-nasazijoso.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_off00006be6.bin
3dc8f0b809b2c789f09df18230cbbbda1b384ce348211de730d926fd9e4e1fc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE6 7508 bytes

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