Malicious PDF — malware analysis report

Static analysis result for SHA-256 322e7e99e290bdf5…

MALICIOUS

PDF

80.9 KB Created: 2021-04-16 21:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eabf1ec6dc016c902e64a15e62e50a5 SHA-1: 75ff7869a9624a7873203ff69bb640267d651ef6 SHA-256: 322e7e99e290bdf57fcf7b3414f86c18632171804a72f06132623cc2d1a7e6be
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The document body, though obfuscated, suggests a lure related to medical school interviews, aiming to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=what+to+know+for+medical+school+interview
    • https://lurutedus.weebly.com/uploads/1/3/4/7/134775874/zotipeg-diruzedewaran-sojeta-tutut.pdf
    • https://fafexozoruxefok.weebly.com/uploads/1/3/4/5/134527426/jisudije.pdf
    • http://xivekoto.medianewsonline.com/aggregate_impact_value_test.pdf
    • http://form-lnstagramcopyrightservice.com/dividing_decimals_worksheet_math_aids6wao6.pdf
    • http://zhigina.ru/fabupifupegunimamiruvgk1p.pdf
    • http://tatanip.medianewsonline.com/intex_krystal_clear_saltwater_system_manual.pdf
    • http://italiahot.fun/biogeography_evolutionh5b8c.pdf
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/8169833.pdf
    • http://ferategaj.scienceontheweb.net/kiwuvekufavebupejezovoxiw.pdf
    • https://cdn-cms.f-static.net/uploads/4404757/normal_60395a1eb8215.pdf
    • https://static.s123-cdn-static.com/uploads/4426957/normal_5fe3ebde1fe3a.pdf
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/buzatedudix.pdf
    • http://xemokajoled.medianewsonline.com/kjv_bible_study_guide.pdf
    • https://sebigazawipad.weebly.com/uploads/1/3/0/8/130814057/zolofagosu_medug_nawugivavunup.pdf
    • https://jibogikufojubu.weebly.com/uploads/1/3/1/4/131438018/bijelixesasekusaw.pdf
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5fc86547e4298.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tosipasakuvil.myartsonline.com/behaviorismo_psicologia_comportamental.pdf
    • http://zuputes.atwebpages.com/93185203529.pdf
    • http://tirigofov.atwebpages.com/72184458027.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbdd.bin
cd0a387c584206831b8df2c4252d9eafc39a711017d426973db759065ad4f6b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 5492 bytes
font_01_sfnt_off00010e81.bin
48d47164deb85797bfc7adb90532b8213f873edd4e7558ba328fc3e384eee338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 11112 bytes

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