Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b24a11e375194f1…

MALICIOUS

PDF

74.2 KB Created: 2021-03-14 16:25:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6f8c600d29412d034a2d109461a3540f SHA-1: bc47e25dce67995aedc62819ddc979284c3b8f03 SHA-256: 2b24a11e375194f14fca61d7eaaf7e5849abfa3522df311711f14b52771cd710
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains keywords related to university admissions, suggesting a phishing lure. The embedded URLs point to suspicious domains, likely serving as redirects to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=makerere+university+private+admission+list+2020+pdf PDF link annotation
    • http://zakosemej.mypressonline.com/ejercicios_balanza_de_pagos.pdfIn PDF document text
    • http://sethel.xyz/pokemon_quest_evolution_chartqjutg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5fd3cc4c2158d.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/gcjiid3/nopebaligavopov.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/corsair_k95_rgb_platinum_mechanical_gaming_keyboard_software.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/18116854131.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/85094474060.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/ZA3ibgj/bubejatu.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/15XIuJx/carx_drift_racing_online_mod_apk.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/capitalization_and_punctuation_practice_4th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/jinavefajevo/ddNjhwx/33027696449.pdfIn PDF document text
    • http://mkuu.club/uft_retroactive_pay_october_2020ryfdm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_601974cde0bf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fcde08605363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf339f50-10c8-4851-85a3-5cbcd93315e5/loxonetumixunodazuzejaz.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_bb5e7cd21e78445e9a78bd179287d234.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18924eca-73f0-4029-9a57-ea4ac5e4e7c1/pukoxux.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_f656c92caf904d0d804183ccb72dba5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77dd87e7-65ba-4e0c-9a68-8b9421b4ed24/zesudefowuvamozuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78257fd4-3a6f-4f73-982f-a12713a59ac0/wilatadaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185c4be2-3d0f-47ec-9867-22f7b25a3c00/xenujuw.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_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 5692 bytes
SHA-256: 6319f07b3d0467835ad5cc8deeb5192df8784e5d1c727698f591aa475099fb36
font_01_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 10912 bytes
SHA-256: b9e707c1bdea516c9461d42fe9d878a2c51fc5b1f6fec58fd77f8259a3b09965

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