Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2826f3060705dfa…

MALICIOUS

PDF

70.9 KB Created: 2021-06-08 20:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3dddc888be962be0b13c55414a184a5d SHA-1: ce23046d5f9585b21de18e396a14c390e0e4f347 SHA-256: f2826f3060705dfa09d5ade03176cbcd92817cfa371205904b793d13ed9ea668
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, which is indicative of a link farm designed to drive traffic or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://laborke.ru/pbw?utm_term=essential+university+physics+volume+2+4th+edition+pdf PDF link annotation
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/rozejuvud-zafivujised.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501965/normal_60014dd7ba8d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5fe26786ec035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488100/normal_5fca92bc9309f.pdfIn PDF document text
    • https://pekupepavipojev.weebly.com/uploads/1/3/1/8/131872203/c5bd2ea43f3cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144609687/98553834097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0732f4-1308-4e8e-b372-3f81ef02d610/45605190453.pdfIn PDF document text
    • http://wezenibafasi.pbworks.com/w/file/fetch/144772908/latest_android_version_samsung_note_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d31e83b-d110-4aeb-a414-c6967974f679/sketchup_2019_download_gratis_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b36085-5021-4377-8d84-e0a497c656d2/dimensiones_deberes_e_implicaciones_de_la_etica_profesional_power_point.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/how_to_hack_someone_cash_app_without_human_verification.pdfIn PDF document text
    • http://nafakogoxu.pbworks.com/f/comparing_mitosis_and_meiosis_worksheet_answers.pdfIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144498420/minecraft_launcher_beta_1.0_3_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd254f2-e188-4405-b0d1-0b9cb825bb32/pewikifoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb6efe2-feff-46d8-b560-3b264b719f9e/cyberpunk_2077_johnny_silverhand_bad_graphics.pdfIn PDF document text
    • http://kekirow.pbworks.com/w/file/fetch/144412473/bir_kawit_phone_number.pdfIn PDF document text
    • http://detomipipu.pbworks.com/w/file/fetch/144712380/manual_de_limba_romana_pentru_straini_download.pdfIn PDF document text
    • http://katexawa.pbworks.com/w/file/fetch/144874704/76004633359.pdfIn PDF document text
    • http://nugewus.pbworks.com/w/file/fetch/144656469/coin_master_hack_apk_ios_download_2021.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/f/pyar_jhukta_nahin_mp3_download_pagalworld.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_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 5736 bytes
SHA-256: edd2ffceb8cb361e6589e72fe737696b9314559d9729be67493b98b510aaf498
font_01_sfnt_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 11044 bytes
SHA-256: 02c8bf18a90711a9ac4f644581e6af4ca2446bece4b2acccc3b51773f7d4d820