Malicious PDF — malware analysis report

Static analysis result for SHA-256 de74d39e73384a07…

MALICIOUS

PDF

75.5 KB Created: 2021-02-26 20:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7f64b4b0321b1bf816a2a6dc9a9f6127 SHA-1: 247b400070bce7e593bc10bf79c33bf4d9ea0f69 SHA-256: de74d39e73384a07b66730c28e4a37310d17a1bf052d4ee7d0f9544f18e87efa
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The embedded content, though heavily obfuscated, suggests an attempt to disguise malicious links within a seemingly innocuous document. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=i%2527ll+be+gone+in+the+dark+hbo+series+review, which is likely used to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=i%2527ll+be+gone+in+the+dark+hbo+series+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459791/normal_60199e9779be5.pdfIn PDF document text
    • https://vomimefime.weebly.com/uploads/1/3/5/3/135316042/2299626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_5fdb537c0de0e.pdfIn PDF document text
    • https://jelugofinetala.weebly.com/uploads/1/3/5/3/135389066/xemavugegowu-nowasoxezifade-xugovu-pezazelar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426425/normal_6001f7f7d1cb4.pdfIn PDF document text
    • https://rewazute.weebly.com/uploads/1/3/4/6/134648352/4e913a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_5ff2bc290c9dc.pdfIn PDF document text
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/rujefur.pdfIn PDF document text
    • http://jodekemawa.22web.org/el_espiritu_de_dios_est_en_este_lugar_acordes_piano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385206/normal_60053a57d7142.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/14334263136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_600121cb8f19c.pdfIn PDF document text
    • https://majejuwusi.weebly.com/uploads/1/3/2/3/132303270/4895829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_60147ced94cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_6019681c4b5ad.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/goneduzum/koriranis.pdfIn PDF document text
    • http://toguxekedufu.epizy.com/26309553117.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/belling_ih60r_induction_hob_manual.pdfIn PDF document text
    • http://wififeju.atwebpages.com/ribisodomelavur.pdfIn PDF document text
    • http://tajomum.epizy.com/non_reducing_sugars.pdfIn PDF document text
    • http://vitorozakosi.rf.gd/80968334386.pdfIn PDF document text
    • http://vanakodezifezuv.epizy.com/dubirewefakemi.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_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 5416 bytes
SHA-256: 1b810c78a1a9a6e7d02af4483ec226ff89dab321464656d4579cde7d82c233f3
font_01_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 10740 bytes
SHA-256: 49c091411e115f6fd4eeed4499c9410e5afb46dec5176ec853cff1e64d22f0fa

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