Malicious PDF — malware analysis report

Static analysis result for SHA-256 745e294a384dd0d1…

MALICIOUS

PDF

67.9 KB Created: 2021-02-24 00:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 653244b03957dc20a0147f95957e1298 SHA-1: 1fe26d2108bf4e9c2c0c057a45e1fb75f69dd35b SHA-256: 745e294a384dd0d1051b06e3677dbb40d6209dec7a3ce0ed9af8a59b400c070f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to academic materials, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/wix?keyword=fundamentals+of+physics+7th+edition+solutions+manual+pdf PDF link annotation
    • http://muzolifuvekimew.22web.org/canzoni_napoletane_karaoke.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/pulovabebokerodcsbnk.pdfIn PDF document text
    • http://beremoter.online/descoware_vs_le_creusetpe5kr.pdfIn PDF document text
    • http://copytoshka.ru/funovujoxoxuvibn6j8q.pdfIn PDF document text
    • http://theraisins.pro/piweparacnvoo.pdfIn PDF document text
    • http://fruit-italy.space/katafukefoneninxo2dg.pdfIn PDF document text
    • http://demask.space/advantages_and_disadvantages_of_mobile_phones_in_pointsf3r3p.pdfIn PDF document text
    • http://tuwuzesuwew.iblogger.org/setifu.pdfIn PDF document text
    • http://tehnotop.site/fuzisokukapamuba6b74d.pdfIn PDF document text
    • http://prodson.fun/midiru846a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/najubu/kerokikamap.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/66298226581.pdfIn PDF document text
    • http://tavejetenugaku.epizy.com/fowekizivusaxid.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/viwevosukuwamego.pdfIn PDF document text
    • http://xepatijorarizom.epizy.com/lijinulevubadojal.pdfIn PDF document text
    • http://jidowadosul.epizy.com/42132753817.pdfIn PDF document text
    • http://jatomije.rf.gd/advanced_investment_appraisal_questions_and_answers.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_off0000bf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF51 3336 bytes
SHA-256: b99efacd1a4e1a6165c4e7fe34821784165281efae69f743cbdbf0e91ab8a879
font_01_sfnt_off0000cb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 5436 bytes
SHA-256: 0bfe5eabfaf8b847f19193b1029a6daac793203244105f5cfe009eced8c80934
font_02_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 10688 bytes
SHA-256: 506600246a949c8e5ed1078e23d02c20d610000ed0ea8fbd81847c0ffce2a2b0

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