Malicious PDF — malware analysis report

Static analysis result for SHA-256 366560e3f9d03fa6…

MALICIOUS

PDF

37.0 KB Created: 2020-06-19 20:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 247635646a6984b941257011557d5774 SHA-1: dc44002bc93233c2bd482151437a82c1a644e826 SHA-256: 366560e3f9d03fa6146cc9285d3e39e9c61d5882385bb2f2719cc858091b1823
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body text and embedded URLs suggest a lure related to 'UC Davis textbook buyback', likely intended to direct users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure with a link farm points to a delivery mechanism for further compromise.

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://youcansport.com/uploads/1/3/0/2/130289772/130289772.html#uc+davis+textbook+buyback
    • http://yukonspeedskating.ca/uploads/1/3/1/4/131437906/f609fd3d883f.pdf
    • http://texaspools.net/uploads/1/3/0/5/130588203/mujawolavojoz.pdf
    • http://74-123-73-232.mgwnet.com/uploads/1/3/0/4/130435673/46c3d245f2a.pdf
    • http://soloporque.org/uploads/1/3/0/4/130475939/89ddac.pdf
    • http://asesoresdesegurosmanejar.com/uploads/1/3/1/4/131412858/tosowese-kuwisodejus-salamuvupem.pdf
    • http://propertypeninsula.com/uploads/1/3/0/9/130969759/638405092dc9174.pdf
    • http://powerconcious.com/uploads/1/3/0/2/130270937/limug_jenutarewoxi_suwexixuxodamif_fuxixagaxexi.pdf
    • http://mail.crushthemarket.com/uploads/1/3/0/2/130289189/933c2575bdacd7f.pdf
    • http://74-123-72-38.mgwnet.com/uploads/1/3/0/5/130590521/zunasofenalud_ruzowow.pdf
    • http://daily3.us/uploads/1/3/0/7/130739522/deviwenemam_juzetavoribif_poxofozominune.pdf
    • http://hostmaster.mythrasbooks.be/uploads/1/3/0/6/130621880/7038429.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_off000052b4.bin
e53c5ab9ad42e9468be8ec95513968fe5b18a125dbf7618f842d4159e62feef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52B4 5004 bytes
font_01_sfnt_off000063d2.bin
a07abf05439fc79aa4f027ae5e3b7a8bb665d9f7fe944ed849f6e59d3254b18f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D2 10552 bytes

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