Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c15e1b8b8fa4014…

MALICIOUS

PDF

76.1 KB Created: 2021-04-05 00:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bfd328918a31933dc8b74bc1ea24467e SHA-1: 33420507a8d98dd54cfefc3eace425508a77c7af SHA-256: 9c15e1b8b8fa401450a37187546d25a2bf0b6e62ff6fb7fb5707523a6fff46eb
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, indicating it likely serves as a phishing lure or malware distribution vector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous embedded URLs suggest an attempt to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, possibly leveraging embedded JavaScript for further exploitation.

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://lozipotod.ru/123?utm_term=hallelujah+chorus+violin+1+pdf PDF link annotation
    • https://cdn.sqhk.co/xiponamoribo/cjb0n3l/kali_linux_hacking_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/5xDrpgj/naxakibazepevitebopenu.pdfIn PDF document text
    • https://dikasawo.weebly.com/uploads/1/3/5/3/135349802/dodojak_xepibirole_ninod.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/tiigich/war_of_worlds_epix_imdb.pdfIn PDF document text
    • https://cdn.sqhk.co/doboketuzoj/kijjieX/fumikirilupokuf.pdfIn PDF document text
    • https://lifeniwa.weebly.com/uploads/1/3/4/7/134716756/d887ec52763d6.pdfIn PDF document text
    • https://togijiwasifuva.weebly.com/uploads/1/3/1/3/131398416/2774560.pdfIn PDF document text
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/pibed_simufe.pdfIn PDF document text
    • https://ganakinupep.weebly.com/uploads/1/3/4/5/134599301/tunupelogu.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/tezosolirulalukok.pdfIn PDF document text
    • http://xodinazafomizi.22web.org/luregomudifuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e542e5b-c5b3-496c-9f6a-5fccf702033f/what_is_the_healthiest_frozen_dinners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f0a200-4661-4318-92ee-a1a55f322f55/83911756933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97fbc6d7-141c-4004-8987-b822b726b2de/vakajukosuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d25e35-c359-4617-b9ef-b5b6a16b7aef/luwavavodazidezubas.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/lojezarovizevutiz.pdfIn PDF document text
    • http://bexalaxawuwe.rf.gd/6848960530.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/dilawiwaguxomusipelezemi.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_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 5392 bytes
SHA-256: a82c9cc36ba277ac008275b7d666d7df16a7d6d1b1b08d1ffc0c166d751281b1
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 11664 bytes
SHA-256: a636425b7a9235d1c419dc31eed028143df00210df18f7ef28337f087231f36d

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