Malicious PDF — malware analysis report

Static analysis result for SHA-256 733fb8ee26cb985b…

MALICIOUS

PDF

71.2 KB Created: 2021-03-17 02:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e3707a00875dc4342d727220e9054548 SHA-1: 53284b9d1ff11310ce83709bae6ee038d3cfbc86 SHA-256: 733fb8ee26cb985bdd159425083dae54a39d782bf4e6fb43384db4985e28e4bd
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous external links, many pointing to disposable hosting services, and is flagged by ClamAV as a phishing trojan. Heuristics indicate a brand-impersonation credential phishing lure, specifically mentioning Facebook. The embedded links likely redirect to malicious sites designed to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bitipobigexu.weebly.com/uploads/1/3/5/3/135399459/4541742.pdf.
  • 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://dugedepap.ru/wix?keyword=those+winter+sundays+answer+key PDF link annotation
    • https://bitipobigexu.weebly.com/uploads/1/3/5/3/135399459/4541742.pdfIn PDF document text
    • https://cdn.sqhk.co/zudoputasafe/qchhhgT/sozonubujumiduzaxasa.pdfIn PDF document text
    • https://cdn.sqhk.co/nutanujel/hijfich/website_perspective_mockup_psd_free.pdfIn PDF document text
    • http://cuzinfo.ru/nazipalokeleboc2oxu.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/PEMidgi/jofojuxixifatotafosilokom.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/duporu.pdfIn PDF document text
    • https://cdn.sqhk.co/monejipo/hPljhXo/50146104029.pdfIn PDF document text
    • http://hightrade.club/fufobobedi8ml.pdfIn PDF document text
    • http://insta-sale.site/construccion_del_conocimientofh5so.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/iJijggq/redarawenokugoris.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/Yohhgdg/32583673261.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/2ohbhhH/bivelulerezewasus.pdfIn PDF document text
    • http://mivofalo.22web.org/advaita_bodha_deepika_portugues.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/hcEhhje/splendora_tx_weather.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/d9452256-35b2-46fe-b745-bf825ffe13ef/maariful_quran_english_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c3da27-7a09-4637-8a9c-af05d9b6f98d/zimezemutolagonovosukatej.pdfIn PDF document text
    • http://nifogegaf.epizy.com/vujinujuwaxivawebixani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5750dfd6-0975-4c20-a74d-4c476b45b5f5/2015_ford_mustang_gt_premium_convertible_for_sale.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_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 5088 bytes
SHA-256: 1dcb09cb8ad87c7ff1c212a648863c9c0ba87f2899e19bcda7b83c74c92a1eb3
font_01_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 10268 bytes
SHA-256: 7720c6b1f628a54b6bb407014d8e8d36f39eb499f0953fb7b974e97027d8ccb9

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