Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc1691c92f6d357…

MALICIOUS

PDF

83.5 KB Created: 2021-04-11 02:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bbfea169be900163bfb12bd6e1dbe854 SHA-1: e7d627798fd4818d14dc8225e50ecec43ff6c2ee SHA-256: 8fc1691c92f6d3576dc29d6138bdb53b0a43c079fc8c0e50918898f6508ecbf1
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and exhibiting characteristics of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=onn+tv+codes+for+uverse In PDF document text
    • https://tujarabevazedi.weebly.com/uploads/1/3/4/2/134235746/8704597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_606ba2165b08e.pdfIn PDF document text
    • http://konerovukivi.iblogger.org/capitalization_worksheets_grade_6.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/putamajus.pdfIn PDF document text
    • https://wegejazibeb.weebly.com/uploads/1/3/5/3/135305894/rixebijilulixi.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/online_translate_dutch_to_english.pdfIn PDF document text
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/jonamupow-daremopuwufi-rewebipedokamu-gufilubevezux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_6042dd6253df9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wuxizajepasuwu.epizy.com/cmc_entrance_exam_question_papers.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_27535e9ad4024e7b951fe7c3aeeda9da.pdf?index=trueIn PDF document text
    • http://vakabivemu.epizy.com/how_to_adjust_temperature_on_ge_adora_refrigerator.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_57569483005947d29471be9b445fb3c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefovu/fegasekegele.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/10969426182.pdfIn PDF document text
    • https://0978d23c-7b87-408a-b4ab-ff16da0dae51.filesusr.com/ugd/369d68_fab0d8cc2889454caf5efb6371f155dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/befarekogol/jajitikilozimulemenif.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/what_are_the_different_types_of_war_poetry_and_examples.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/levaje.pdfIn PDF document text
    • http://gogujigasad.onlinewebshop.net/taluxepatajunev.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_6085357d5c3c4984ae438e6490fa636a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/15173890787.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 4696 bytes
SHA-256: d6aee84700dcb942ad3b7c8e39be45373c225ecb8ed0d467dabcb92bc33e8960
font_01_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 12280 bytes
SHA-256: d8031194130126d2c67f80592ad396e8a35d1afe2f03de4a0da7857ae6cdc846
font_02_sfnt_off00013240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13240 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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