Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4e6a3e0ad81d7b…

MALICIOUS

PDF

77.0 KB Created: 2021-04-02 04:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4a814ce9482d8b4c1ba7453cbcb0b38c SHA-1: 634b450afeaa1f604689d4d34d41be26fbf9545a SHA-256: 5b4e6a3e0ad81d7bcbfb6023cc2f1e16ecdc17289bea2824e7944d5d72172012
146 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a phishing lure, specifically a callback scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=do+priority+mail+have+tracking+numbers PDF link annotation
    • http://wordwild-store.com/download_village_and_farm_mod_apk_revdl7nytm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_6026f5cc5e8c5.pdfIn PDF document text
    • http://disozire.mygamesonline.org/how_to_sub_to_someone_on_twitch_prime.pdfIn PDF document text
    • http://vizionsmc.net/laptop_motherboard_circuit_diagramvn1n8.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/vubevunagenixuvonofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_6036643dbc7bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_60410190361df.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/puxidosorupawaxoribubozir.pdfIn PDF document text
    • https://vulakesekek.weebly.com/uploads/1/3/1/4/131438428/9be92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_5fdb91a49f540.pdfIn PDF document text
    • http://ubzvp.com/gukurazenifataxapigajuj0lqy.pdfIn PDF document text
    • https://jaxuguduju.weebly.com/uploads/1/3/4/4/134442137/f521b6729580.pdfIn PDF document text
    • https://mibimosa.weebly.com/uploads/1/3/5/9/135959727/2958287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_605795e21d283.pdfIn PDF document text
    • http://sk-anker.ru/facebook_sea_ray_owners_club9tg4s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409811/normal_5fee1d3cac3f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368747/normal_6007d11ad2f61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidajalej.onlinewebshop.net/60136198781.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/hoover_floormate_deluxe_hard_floor_cleaner_moondust_review.pdfIn PDF document text
    • http://dapizodipe.myartsonline.com/how_to_find_common_stock_dividends_paid.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/how_much_do_navy_submariners_get_paid.pdfIn PDF document text
    • http://levapoloj.onlinewebshop.net/chaos_knight_codex_vk.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/85797152064.pdfIn PDF document text
    • http://xogaduzop.atwebpages.com/body_systems_book.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_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 5712 bytes
SHA-256: 2b2eb2d15ec1d848e6273f83b91da78317d5135e27eb34969e1d31a0db183bd8
font_01_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 11624 bytes
SHA-256: 41daa0c9ab7b52384f81bb1b677c4a1dc5d97adfd8f0ccd24c7ac6c69054739b