Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e21467ab9aa1daa…

MALICIOUS

PDF

77.0 KB Created: 2021-05-01 18:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d52b08eb72a43450172cf1a52b169e03 SHA-1: 1e812f79dc4d5146da0487d4049ed3cd6dfa3ebf SHA-256: 8e21467ab9aa1daa4de409fea679e8019ad1d10361aced629b04ffa8d9ff3c38
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to host multiple PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and the presence of many external URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=naming+ionic+compounds+chem+worksheet+8-2
    • http://rusewigojubilon.mygamesonline.org/jopaninosajesifik.pdf
    • http://zakewabo.scienceontheweb.net/34949606219.pdf
    • http://giwewigipebi.medianewsonline.com/gozarivan.pdf
    • http://misulilexu.22web.org/black_and_decker_line_trimmer_spool.pdf
    • http://gimarokonul.22web.org/duxolabolosibemo.pdf
    • http://gajaxujifusokul.mygamesonline.org/what_is_antigen_and_antibody.pdf
    • http://givepamodugag.22web.org/29481629180.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_9cf00bcd18954971a6d60c7f33892493.pdf?index=true
    • https://s3.amazonaws.com/punagilelabon/varepetuwuw.pdf
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_4823313e9d6545419cf371ca087f815e.pdf?index=true
    • https://s3.amazonaws.com/verirejon/58216105066.pdf
    • https://s3.amazonaws.com/zalisujezajaje/boredomafijeguxezosuxiru.pdf
    • https://s3.amazonaws.com/winumigutam/43590566031.pdf
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_3a2f03dfe83b46f58d448bf0318035e1.pdf?index=true
    • https://s3.amazonaws.com/gezizefefififa/us_citizenship_test_questions_and_answers_cd.pdf
    • https://s3.amazonaws.com/kujesulad/jaxuwu.pdf
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_67a86f7a16f947c5a18984a7d7601183.pdf?index=true
    • https://s3.amazonaws.com/gapuruxumeg/the_ultimate_guide_to_tarot_card_meanings_download.pdf
    • https://s3.amazonaws.com/feseni/peteduluw.pdf
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_f73f20ff77cd4ff38c2f476fc48047d5.pdf?index=true
    • https://s3.amazonaws.com/dotivaf/55657204058.pdf
    • http://patabajisof.epizy.com/how_to_reset_the_whirlpool_dishwasher.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://www.parents.com
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dddd.bin
57619efdcb55d3a1f8c725c431c09f1b47032c218d51cd467ebfb6c3b7b38376		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 5820 bytes
font_01_sfnt_off0000f195.bin
458119a819e7719dca067929c6588ca613e058bec0be2cb0773e176aaf29a361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 10828 bytes
font_02_sfnt_off00011621.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11621 4324 bytes

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