Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86544d1f499af06…

MALICIOUS

PDF

86.8 KB Created: 2021-04-27 11:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1b5b934e112e59cef940f6299d19f97f SHA-1: f6d6bc50d336ee19f28621eb09a9b92f1375c0d1 SHA-256: a86544d1f499af06140e8bc8c2902b240077160abbe26a232f1829793d14b189
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to malicious websites. The document body, though heavily obfuscated, contains keywords related to a furnace issue, likely a lure to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=hydro+flame+furnace+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417988/normal_6060eed3df8ff.pdfIn PDF document text
    • http://gezetola.scienceontheweb.net/cracker_barrel_to_go_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/3EijigK/debiwimenorinaguro.pdfIn PDF document text
    • https://jopokiwajisi.weebly.com/uploads/1/3/4/1/134108554/gikibixekapul_nebilife_wevejudi.pdfIn PDF document text
    • https://cdn.sqhk.co/lasumalena/XigoCja/nifejomizafowiti.pdfIn PDF document text
    • https://bulejoge.weebly.com/uploads/1/3/0/7/130775594/befokipeput.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/bIlQwsJ/nigarurez.pdfIn PDF document text
    • https://mavilefisubagar.weebly.com/uploads/1/3/1/6/131606233/1079469.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5fcbfdedd8832.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/mTPibNj/91784935569.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/c_technical_aptitude_questions_answers.pdfIn PDF document text
    • https://dufofisejufosu.weebly.com/uploads/1/3/4/8/134875198/8783399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368479/normal_5ff2796f4db51.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/cecelib_possessive_series_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vekunego/4H1aibr/gravity_coin_pusher_game.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdfIn PDF document text
    • https://cdn.sqhk.co/vusabutam/fStHhfs/hockey_shop_appleton_wi.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://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_eb4d596d0ab44dcf9321ca7153410026.pdf?index=trueIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_89943199c3fb4937a39b9dbfa5b39cf9.pdf?index=trueIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_4187c5a44022404f81b67f056e67a7a7.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_a8a0d96fc65f4ff0a646dcedabd2a1c4.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_6bff90f2873340acaf92d1d78b9bc181.pdf?index=trueIn 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_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 5264 bytes
SHA-256: 020a618913449578c867319f39e0443ed65791a21c9ea79b24d999bc2254bd08
font_01_sfnt_off00011841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 10936 bytes
SHA-256: bda52a1a5041091b41acd18ef9c2abd0b47c4689af02f787c953f23236d730a7
font_02_sfnt_off00013d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c