Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d61888ca613b365…

MALICIOUS

PDF

89.9 KB Created: 2021-05-23 22:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c58ebcdb5c11eec91839eca7c9de9f72 SHA-1: ec0c2e201b699b6a0af927402b29dd37b1ebf40d SHA-256: 6d61888ca613b3650b8a46de0b498a61e540087b706ea67127f7d2a241d23bcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The primary URL, https://vilenefex.ru/strik, is suspicious and likely leads to a malicious site. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to potentially harmful content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://vilenefex.ru/strik?utm_term=how+much+does+black+and+white+printing+cost+at+fedex
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5fdf96fa360fd.pdf
    • https://cdn-cms.f-static.net/uploads/4473403/normal_5fe7a11256980.pdf
    • https://cdn-cms.f-static.net/uploads/4477137/normal_60654bda6fbbf.pdf
    • https://cdn-cms.f-static.net/uploads/4473916/normal_602255b59610a.pdf
    • https://cdn-cms.f-static.net/uploads/4481675/normal_5fd6ac589febf.pdf
    • https://cdn-cms.f-static.net/uploads/4503787/normal_605efa73c5316.pdf
    • https://static.s123-cdn-static.com/uploads/4421051/normal_5ff4d2bf8cb1b.pdf
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/2f3d94e5620.pdf
    • https://static.s123-cdn-static.com/uploads/4475719/normal_5fffc360ae679.pdf
    • https://cdn-cms.f-static.net/uploads/4449965/normal_605fb43310d05.pdf
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5fce23a42ff21.pdf
    • https://cdn-cms.f-static.net/uploads/4472200/normal_605d960225884.pdf
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/2692839.pdf
    • https://cdn-cms.f-static.net/uploads/4451756/normal_603a63a505fb3.pdf
    • https://cdn-cms.f-static.net/uploads/4412768/normal_60320e75ec539.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/goveruduzewoxu/nijikoxalatut.pdf
    • https://s3.amazonaws.com/borokegujuzero/dupogalinevujatarixekiz.pdf
    • https://uploads.strikinglycdn.com/files/ec0d3e7a-2f37-47c7-bddf-644f86a1f4c6/17031239834.pdf
    • https://s3.amazonaws.com/figidireki/15886857662.pdf
    • https://uploads.strikinglycdn.com/files/bd1dd74c-90c7-40bb-b703-b37b133f8c37/naruto_vs_bleach_vs_one_piece_game.pdf
    • https://s3.amazonaws.com/fowonaxul/31854728749.pdf
    • https://uploads.strikinglycdn.com/files/d8e59539-325e-4ac3-8675-81dbd09af7aa/teaching_strategies_for_millennial_nursing_students.pdf
    • https://uploads.strikinglycdn.com/files/247bf086-8c5e-4184-9eb5-efae3ea649e3/how_old_do_you_have_to_be_to_be_a_mason.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001105d.bin
4d7c810a173347d2ffb2c53244bef9d0596c4acc8f3501aa2dec2e1437901c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 5776 bytes
font_01_sfnt_off000123e4.bin
4a5a2e3a4a717bcfc5e6f741b4638e6c3487e05788c4c3512669d08dc4fbda95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 11536 bytes
font_02_sfnt_off00014b2b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2B 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.