Malicious PDF — malware analysis report

Static analysis result for SHA-256 831260cdc7a4f9b0…

MALICIOUS

PDF

126.7 KB Created: 2021-05-15 12:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8e4da64b9ec0cdcc728eea7f24648d84 SHA-1: 57e71f0fa247893426652bb3bf18a0dfbcf65a69 SHA-256: 831260cdc7a4f9b0cc5c1a489c6207b1ca40560b06bc64343ac7c5b07b53a569
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/strik?utm_term=allen+%2526+heath+gl2400+40+channel+mixer PDF link annotation
    • https://lajibomigijiku.weebly.com/uploads/1/3/4/5/134587714/jarazefem.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/sejuj-kixip.pdfIn PDF document text
    • https://zigivigafa.weebly.com/uploads/1/3/5/3/135392575/midegagedipotodo.pdfIn PDF document text
    • http://cherrypimp.online/mikiborby28d.pdfIn PDF document text
    • https://ninurakabo.weebly.com/uploads/1/3/4/3/134324479/sesurekexebi_jegodafatixavij_sanejamobe_fatidu.pdfIn PDF document text
    • https://balamunin.weebly.com/uploads/1/3/4/6/134653254/fedat_lowodemiduve.pdfIn PDF document text
    • http://conicppjry.bid/89902907324b24b6.pdfIn PDF document text
    • http://artdebug.site/hess_s_law_cycle_worksheet6jfwh.pdfIn PDF document text
    • http://redpandarecycling.com/ios_13_beta_installation_guide5mh6b.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/S9hj3hh/world_conqueror_2_battle_of_kursk.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/9794419742ljmqt.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/hi6Qjcp/ninja_masters_codes_wikia.pdfIn PDF document text
    • http://bezigex.iblogger.org/cubic_and_reciprocal_graphs_worksheet_tes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mizebonemis.rf.gd/jiwilixi.pdfIn PDF document text
    • https://e5acd528-9925-4355-98ed-6c6122c9c19a.filesusr.com/ugd/49fecd_4f3da77f2c4c41028e33c01c97f695a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24c6ef1-ab2d-4b77-8f66-e34affd4aadc/zavetibekinomomowosifof.pdfIn PDF document text
    • http://xulodolab.epizy.com/sefipifa.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_f58617092f9948d884bdabda26d6b9fe.pdf?index=trueIn PDF document text
    • http://bufagefitazi.rf.gd/lamafikexaga.pdfIn PDF document text
    • http://dalitixusukewo.epizy.com/another_word_for_visual_acuity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0970817-fc5b-443c-890c-cf3b9bd99b06/223509941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c7fb65e-0658-4430-8dce-16948787852e/32145057648.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_off0001b5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5C2 4180 bytes
SHA-256: 7e960216bc863d97ccb9cf997abc9c727eeb9d9dd7ffae73157c9f521ce63587
font_01_sfnt_off0001c3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3FF 12424 bytes
SHA-256: 83613c780fd1b82d340c832fcbca3e9db673bee2d7bccdc6888abd3759c7624b