Malicious PDF — malware analysis report

Static analysis result for SHA-256 2020d1ebe8f4b8a3…

MALICIOUS

PDF

75.4 KB Created: 2021-03-10 11:16:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2105509bbc24769c77522d15a75160d0 SHA-1: eccb78aa21079a44edb81ddf5e505a9f90cd856d SHA-256: 2020d1ebe8f4b8a3d5f2eb6fddbb27aafee78ae2112b0785234599ad67be46e1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('jacksth.ru') that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'how to rig a fishing line', which is likely a pretext to disguise malicious intent. No scripts were extracted, but the presence of multiple external links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/strik?utm_term=how+to+rig+a+fishing+line+for+catfish PDF link annotation
    • http://podarokinsta.online/beginner_s_guide_to_solidworks_2019htb3m.pdfIn PDF document text
    • http://puvogamopuvizux.iblogger.org/kajawefule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464522/normal_5ff5b39323531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_60298e0bd8fe9.pdfIn PDF document text
    • http://copyright-rules-help.com/biddeford_electric_blanket_controller_stopped_working8w9pi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415543/normal_603e668e8ac93.pdfIn PDF document text
    • http://ig-about.net/shakespeare_sonnet_18_poetic_devices6mghk.pdfIn PDF document text
    • http://fortysgjdk.fun/free_printable_logo_quiz_with_answers98fwp.pdfIn PDF document text
    • http://sodahub.pro/nogewuxesirilint97s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376599/normal_5ffdb494cf6a6.pdfIn PDF document text
    • http://wufonidovo.22web.org/guided_meditation_podcast_free.pdfIn PDF document text
    • http://regse.website/19419051840by0yr.pdfIn PDF document text
    • http://rosotorejujuv.22web.org/how_to_manually_defrost_my_samsung_fridge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_600c8e4c3b404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503525/normal_601e919c3e1fc.pdfIn PDF document text
    • http://topcabinets.xyz/best_front_load_washer_dryer_combo_202092hyd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413585/normal_5fff78e014ede.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojepubaxogo.epizy.com/bonivuzafikukin.pdfIn PDF document text
    • http://keretagukuvar.epizy.com/hush_hush_series_movie_release_date.pdfIn PDF document text
    • http://ralemagafi.epizy.com/tufosoxajepo.pdfIn PDF document text
    • http://nizarajizigutut.epizy.com/lubiduwif.pdfIn PDF document text
    • http://wevedikelu.epizy.com/85010801221.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 5196 bytes
SHA-256: cd81f003be8bf10d0dbb90a387045ce49f3e94c0c81f0f0ba2d31dfc7b1b38bb
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 10220 bytes
SHA-256: baab32273b52057fdad531b6d99c15faf4d3ae14618d01986c80c6fc4899fb8c

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