Malicious PDF — malware analysis report

Static analysis result for SHA-256 3490d3f27602324e…

MALICIOUS

PDF

74.1 KB Created: 2021-05-14 13:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1c21ffc6c4f394c3b47f59f802f9fe1d SHA-1: 3d14a628a129b6a587ec7881dd82adf7c47df9b7 SHA-256: 3490d3f27602324e99ea348e0c42c0803b3ee31aba8bd93c424cc3e6dc51b3cd
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jumiwimov.ru', which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf', suggesting it was generated by a tool that can be abused for malicious purposes.

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://jumiwimov.ru/strik?utm_term=lowrance+elite+7+hdi+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460449/normal_606e6166c9571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_601144133bcb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_606365d176db8.pdfIn PDF document text
    • https://vegekonewipure.weebly.com/uploads/1/3/5/9/135964828/7c1ce2.pdfIn PDF document text
    • https://gumosoxegobekij.weebly.com/uploads/1/3/3/9/133999275/5296797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_5fd8957a693eb.pdfIn PDF document text
    • https://xidoteruredogon.weebly.com/uploads/1/3/1/4/131454367/d75da94c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407784/normal_601d3d4f7b9d3.pdfIn PDF document text
    • https://dokurawufiza.weebly.com/uploads/1/3/0/7/130739275/6661950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473415/normal_604ca221ec127.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/9246740.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501632/normal_5fcd5ca254c43.pdfIn PDF document text
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/3711882.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/zalamo_felafalatezi_ruvafe_vomopedav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wovitiku/wikunoretejabomewoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56ce60e5-8f2d-4be9-a5db-ab0e652813ab/reinforced_concrete_design_manual_aci_318-14.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/beethoven_s_9th_symphony_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7211c72c-a4ec-413c-97b8-c3ac8ac09989/proficy_machine_edition_download_trial.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/63894130722.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_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 4996 bytes
SHA-256: 1469e5f1441acaa14deb24ba1313a4be4059051720c0094ad1f11da38b8d4bb8
font_01_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 10864 bytes
SHA-256: 956875a421639c44a2aabb0015fc9b60c1cff3c4324d7743b0dc69e7b7ac9195
font_02_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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