Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b36d159c8479a6…

MALICIOUS

PDF

93.8 KB Created: 2021-05-13 03:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 850985283ce6fb03127df63948200ebd SHA-1: deeb2b3b08541ba7315654e41b336e41c6ff93c2 SHA-256: f9b36d159c8479a61226d22d2c5dabf16795d886a7c7eae41264f0df2e980261
134 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, with one specifically identified as a potential phishing lure related to a sale. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic suggest the document is designed to trick users into navigating to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://soxebez.ru/strik?utm_term=sony+trinitron+crt+tv+for+sale PDF link annotation
    • http://www-sfr-fr-monespace.com/27148440042i8ju3.pdfIn PDF document text
    • http://i-men.ru/95549101979rbg54.pdfIn PDF document text
    • http://pomulagija.iblogger.org/cyberpunk_2077_third_person_mode_ps4.pdfIn PDF document text
    • http://mivarajemaze.22web.org/68333763998.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/76431525967vkh52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455901/normal_6047086c004ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466386/normal_602dfbd81f712.pdfIn PDF document text
    • http://lefuvaguvupawax.iblogger.org/rocky_5_full_movie_hd_popcorn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483072/normal_5fe9acff973a0.pdfIn PDF document text
    • http://usacreditscore.info/compare_agrarian_reform_and_land_reform21c8c.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/mesixadelomomo/35501089587.pdfIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_a684bc9bbbc94600a6de4bc37899c78a.pdf?index=trueIn PDF document text
    • http://tawenaxogiminax.epizy.com/cap_full_form_in_admission.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_77e96da3080a495980a0ccce7a96aeb4.pdf?index=trueIn PDF document text
    • http://dogolevoxameno.rf.gd/best_functional_training_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/because_you_loved_me_celine_dion.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_1ddcd18d53854aeabc9f7cc6719b3b64.pdf?index=trueIn PDF document text
    • http://buvodadixasiz.epizy.com/relafumozokuzazi.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/accordion_book_report.pdfIn PDF document text
    • http://dixasimoxipux.rf.gd/acide_sulfurique_gratuit.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_off00013347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 5140 bytes
SHA-256: accf1fcff739262a6e756af0f9f13a7d596ae5ee546c162a76fff93f516673df
font_01_sfnt_off000144e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E8 10900 bytes
SHA-256: 54124081d47868bdcde4330baaa1f892a59c4e6553141be0115080269efb8247

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