Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e561168eb02f41…

MALICIOUS

PDF

93.1 KB Created: 2021-03-17 07:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c893fbbe534f007f598606e63d6bdb7 SHA-1: de2e4c080dda310692a5de55c0456baa9f8c7e7c SHA-256: 36e561168eb02f41d921e07a30e10fbeb5758823e970ae5dc8297f2c1ca7595b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are associated with link farms and SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic PDF_SEO_LINK_FARM firing suggests a large number of generated links, indicating a broad attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=the+giver+anticipation+guide+answers
    • https://cdn-cms.f-static.net/uploads/4476302/normal_6040034d0af6d.pdf
    • https://vowimusu.weebly.com/uploads/1/3/4/6/134655535/piranixabevujifodipu.pdf
    • https://vinovebavelugis.weebly.com/uploads/1/3/1/3/131383284/9417015.pdf
    • http://nageramuvepom.mywebcommunity.org/30962296887.pdf
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/zaxuvosarutetiwajez.pdf
    • https://gunulavosaki.weebly.com/uploads/1/3/4/3/134374607/5000735.pdf
    • https://cdn-cms.f-static.net/uploads/4371514/normal_600dec37a0290.pdf
    • https://jesokalatozu.weebly.com/uploads/1/3/4/5/134591365/130b392a934.pdf
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/goragemi_tuvawilevi_bazazuxir_lopop.pdf
    • https://wojodusu.weebly.com/uploads/1/3/2/8/132815854/vigotole.pdf
    • https://piminuwimizo.weebly.com/uploads/1/3/4/6/134674326/6159146.pdf
    • http://pekibexuvipeve.scienceontheweb.net/amplifier_schematic_diagram.pdf
    • https://cdn-cms.f-static.net/uploads/4408707/normal_603f088d7e997.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ritanuwo.epizy.com/balance_3d_game_for_computer.pdf
    • http://difugarulid.epizy.com/xirozu.pdf
    • http://lagunuriteg.rf.gd/why_is_my_hard_wired_first_alert_smoke_alarm_beeping.pdf
    • http://kurejob.epizy.com/multiplication_problem_solving_worksheet.pdf
    • http://medexode.atwebpages.com/tovowizupewukidarojedub.pdf
    • http://mazoted.epizy.com/63339925833.pdf
    • http://malalepotim.rf.gd/final_fantasy_xvi_-_awakening_trailer.pdf
    • http://duzatip.rf.gd/hpi_baja_5b_parts_list.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f85.bin
eddc7c104257fca617fe7c412a18acf9afb4b8530e9734eb2cc0d0803037020a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F85 5404 bytes
font_01_sfnt_off000141f9.bin
807133295f0fda32e4f413db83b07ff833e03061492163c7db110bd3102482a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141F9 10916 bytes

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