Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d32e553be2e86d…

MALICIOUS

PDF

82.8 KB Created: 2021-04-30 19:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2973ce2dc57634b47a20d5b8881bc542 SHA-1: a641c58101ca56dd272de79392e9f4f662ee8113 SHA-256: 27d32e553be2e86d5f30200b337f3a64954f8cc89768e6edc09d5e1499a6ace6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The document body contains garbled text, suggesting it is not intended for human readability but rather to host links or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://maypoin.ru/strik?utm_term=adobe+premiere+rush+green+screen
    • https://xedawazusaxe.weebly.com/uploads/1/3/2/3/132303108/kazewatuzasutik-boziwaxumaba.pdf
    • https://cdn-cms.f-static.net/uploads/4371266/normal_604e296b3d86a.pdf
    • http://busapibasin.mypressonline.com/celta_course_book.pdf
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fcfb7ace3933.pdf
    • http://dusanaputojinon.mygamesonline.org/jurnal_pendidikan_agama_islam.pdf
    • https://sagedawigaput.weebly.com/uploads/1/3/4/3/134336778/pepijovez.pdf
    • http://vadosaj.getenjoyment.net/lukejelosenozifose.pdf
    • http://fegivate.medianewsonline.com/star_trek_discovery_season_3_episode_9.pdf
    • http://kurutog.mygamesonline.org/jeux_pour_apprendre_le_francais.pdf
    • http://rolopigabetitu.scienceontheweb.net/29582504493.pdf
    • http://nafarami.medianewsonline.com/jiwizotaximof.pdf
    • http://narawodosure.medianewsonline.com/polosozesimazevaboxe.pdf
    • http://pivolirarorip.mypressonline.com/sap_accounts_payable_transaction_codes.pdf
    • https://lalurarejodu.weebly.com/uploads/1/3/5/2/135297054/c9e7560.pdf
    • https://cdn-cms.f-static.net/uploads/4495264/normal_6021e8e645f00.pdf
    • https://cdn-cms.f-static.net/uploads/4470553/normal_604f95dc01945.pdf
    • https://static.s123-cdn-static.com/uploads/4485313/normal_5ff2e025770a0.pdf
    • http://majusenise.sportsontheweb.net/52931548101.pdf
    • http://dusibarupuguli.medianewsonline.com/19438605392.pdf
    • http://liberum.sportsontheweb.net/70479197400.pdf
    • http://vojemodipu.sportsontheweb.net/315373572.pdf
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/4864774.pdf
    • http://jemulobapamiwu.mywebcommunity.org/just_2_words_level_575.pdf
    • https://sexiguviwuzokal.weebly.com/uploads/1/3/4/6/134687255/84313601945.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lapetagalelan.myartsonline.com/namugerumalo.pdf
    • http://wozitoso.atwebpages.com/8659063609.pdf
    • http://pebomotixot.myartsonline.com/pdf_text_editor_freeware_download.pdf
    • http://bitines.myartsonline.com/pet_plan_insurance_claim_form.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010548.bin
20e7809bba1fe9144662477c59dcb97360539db0a75fef66c56730e578346175		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 5372 bytes
font_01_sfnt_off00011765.bin
519184cfd9fe08f7709ba5e9106ea5196f8fdda1db32ee6e018421614e7b1d19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11765 11144 bytes

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