Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7561bd4029cf64…

MALICIOUS

PDF

37.6 KB Created: 2020-06-20 13:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e38888010777e9e168fdd152b0a12bda SHA-1: 2c7da339f03f5984461477831342bbfc9e3787f6 SHA-256: ed7561bd4029cf6469e26c5d2515e374ef0701323f667e8571cf3b3ade54ce46
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or SEO poisoning tactic, designed to manipulate search engine results or redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lsr3pzn.brdge.org/uploads/1/3/1/0/131070753/131070753.html#guitar+lessons+gainesville
    • http://trinityorlando.org/uploads/1/3/0/8/130813736/pipidefuse_mifuw_nopevep_vevojoj.pdf
    • http://bestieboxboutique.com/uploads/1/3/1/4/131437627/4e945dd3e.pdf
    • http://istanbulletinonline.com/uploads/1/3/2/3/132303092/df9a3b4fe150.pdf
    • http://undefendedheart.us/uploads/1/3/0/8/130873880/puzefogin.pdf
    • http://mail.browbeginnings.com/uploads/1/3/0/8/130815381/mofekud.pdf
    • http://thatartshow.com/uploads/1/3/0/4/130476485/rugedilevepimafis.pdf
    • http://funusirae.ca/uploads/1/3/0/2/130287371/98e89f5.pdf
    • http://doublewitch.com/uploads/1/3/0/6/130639178/ragixokig.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_off00005709.bin
611c90ebbd6bd6f362effb86ae90c03304d6286304c68b66d62d193716bae6ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5709 4824 bytes
font_01_sfnt_off00006789.bin
1b9a262bac175d64d94ddd60bc789a9a413fdc0b6ceb4f9928739b59a3f010ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6789 10684 bytes

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