Malicious PDF — malware analysis report

Static analysis result for SHA-256 3844e1e8429706af…

MALICIOUS

PDF

73.2 KB Created: 2021-04-20 11:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3c8c64cb4299327f152335a75c586e9b SHA-1: 617300598204f72accf7bd97e941b06dc9318ec4 SHA-256: 3844e1e8429706af58b419cab3293b6f783aa6c9d05121d995127b3f53bf3560
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=what+are+5+text+structures PDF link annotation
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/2885b951ff4c87.pdfIn PDF document text
    • http://bluebadgeapproval.com/the_inferno_summary_by_cantoyb3mx.pdfIn PDF document text
    • http://naturagrush.space/physical_chemistry_tinoco_5th_edition_download1kqa8.pdfIn PDF document text
    • http://mojofaza.mypressonline.com/98157661945.pdfIn PDF document text
    • http://xovitixekewelom.scienceontheweb.net/lexelagalikalusex.pdfIn PDF document text
    • https://poxokisajape.weebly.com/uploads/1/3/4/5/134592502/nogojufanetasematix.pdfIn PDF document text
    • https://lepoboniw.weebly.com/uploads/1/3/0/9/130969744/8afcde34b41.pdfIn PDF document text
    • http://danoguvu.medianewsonline.com/85997674702.pdfIn PDF document text
    • http://avtoshtorki.shop/12701662702sflnh.pdfIn PDF document text
    • https://lefukumot.weebly.com/uploads/1/3/4/8/134887275/muxadun.pdfIn PDF document text
    • http://parkji5x.xyz/algorithm_design_techniques_narasimha_karumanchiwrjb4.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/47502622763.pdfIn PDF document text
    • https://latifaxegorur.weebly.com/uploads/1/3/5/4/135400737/4661049.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/how_much_is_wifi_on_allegiant.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/c7f5011a-c222-4e78-b4be-3210a7d181d3/cuantos_metros_mide_un_lote_de_terreno.pdfIn PDF document text
    • http://pojovalomoj.epizy.com/healthcare_data_analyst_jobs_indianapolis.pdfIn PDF document text
    • http://pugegexu.rf.gd/40441325658.pdfIn PDF document text
    • http://rivebop.epizy.com/niviverosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33c4332-236a-4639-b871-3c0ac28718d0/93170743241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf64d06a-2999-4edb-8402-fd267dfe168e/kuzoroxanawejofos.pdfIn PDF document text
    • http://bojefej.epizy.com/tikigabelotip.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_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 5060 bytes
SHA-256: 38a82b6b171c9471b2255c77c3e645490542bdced23fb5ed7d162e5870cd5f48
font_01_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 11184 bytes
SHA-256: c9d4d22d6ab56abe847f577a64310d2805b0d3bc4c1defa518316f2c3a4d07a5

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