Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0575fe6f8fb6151…

MALICIOUS

PDF

87.2 KB Created: 2021-03-18 18:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6e430fe55c9f9e31a2100c4a16537d53 SHA-1: ad3e6bb2005f302149491aa0ae8b2c6983fc0975 SHA-256: c0575fe6f8fb61514087e5232cda2ec6854a32441ddfc39d550c38723832f6ed
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and displays a fake CAPTCHA. The document's structure and embedded URLs suggest an attempt to lure users into clicking malicious links, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://botokaw.ru/123?utm_term=made+in+chelsea+season+13+episode+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485001/normal_5fce5fe5c4de1.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/printable_worksheets_for_kindergarten_math.pdfIn PDF document text
    • http://sulevaxobema.22web.org/ch_10_states_of_matter_virtual_lab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_602e6a882fd04.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/EhghdMZ/wiwilemozowazerudi.pdfIn PDF document text
    • https://cdn.sqhk.co/zapoboveje/bjihchM/rafawewurovijatulifinubi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422890/normal_5ff3383d3cede.pdfIn PDF document text
    • http://betomererag.iblogger.org/bifelovefagudojero.pdfIn PDF document text
    • https://cdn.sqhk.co/govovazeket/4Xgcwl0/girl_skins_namemc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_601420adca984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_603b3b668791a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://winulesodix.rf.gd/xogotefuvetetanagepi.pdfIn PDF document text
    • http://bodagoge.epizy.com/lewuzukiluteruwaxogi.pdfIn PDF document text
    • http://bebezira.epizy.com/formule_magique_pour_attirer_l_argent.pdfIn PDF document text
    • http://givinedefadedi.rf.gd/organizational_culture_and_leadership_schein_1992.pdfIn PDF document text
    • http://titarejidawe.epizy.com/autoenginuity_software_free.pdfIn PDF document text
    • http://retudazugo.rf.gd/canon_printer_setup_file.pdfIn PDF document text
    • http://zuraravata.epizy.com/ariston_washer_dryer_combo_armf125_manual.pdfIn PDF document text
    • http://duposul.epizy.com/kidney_stone_symptoms_merck_manual.pdfIn PDF document text
    • http://debumiputun.rf.gd/environmental_portrait_photography_guide.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_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 5460 bytes
SHA-256: 30ebcb24b17ed94020299f48f3a1323388eeb5f2f20e07ffee5a2848f1d25286
font_01_sfnt_off000129ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AE 11156 bytes
SHA-256: 95845c2d4875ed01c93997016acb20f883344bf044d609f2faaa0da2ebdddf93

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