Malicious PDF — malware analysis report

Static analysis result for SHA-256 7946acabf1c61cb1…

MALICIOUS

PDF

75.0 KB Created: 2021-04-02 01:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d8651559c8dd68f3f9a41db0e7d27b81 SHA-1: fe07e03841290fd7e0c178d0b5e9a7384278fe8b SHA-256: 7946acabf1c61cb121bebe9d612c41789c473bfcead028b8f300176e7a407078
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a network of links. The embedded URL 'https://vilenefex.ru/strik?utm_term=what+is+the+best+qualitative+data+analysis+software' further supports the lure by mimicking a search result. Although no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score point towards malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://vilenefex.ru/strik?utm_term=what+is+the+best+qualitative+data+analysis+software PDF link annotation
    • https://cdn.sqhk.co/gobuwovuv/oggifgi/sadopulasexidesu.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/reflected_best_self_exercise.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/BqOHiaR/tamil_nursery_rhymes_lyrics_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/fekuseguxe/nLjeQKZ/zombie_hunter_zombie_killer_3d_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/g7VUwZS/yamasa_king_pulsar_slot_machine_manual.pdfIn PDF document text
    • http://wegoradubi.sportsontheweb.net/autodesk_vault_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/jgz9gjd/dabagifojafibuwamogube.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/3646617.pdfIn PDF document text
    • http://dekovag.mypressonline.com/arnold_toynbee_study_of_history.pdfIn PDF document text
    • https://reruwezoketa.weebly.com/uploads/1/3/4/5/134503250/talilubikodavanamix.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/hbdghjh/felunodez.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/jahbhgQ/tamomasimudiduxatelase.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/chhgdI4/tipicidad_derecho_penal.pdfIn PDF document text
    • https://kedepojab.weebly.com/uploads/1/3/0/7/130739947/mifizudodaw.pdfIn PDF document text
    • http://repizedozoful.sportsontheweb.net/migofiriwovajemuguti.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/how_to_clear_memory_on_omron_hem-711.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/hcidMgi/1660286561.pdfIn PDF document text
    • http://tagoturuluro.medianewsonline.com/duxorusetofidelore.pdfIn PDF document text
    • https://bupefozatige.weebly.com/uploads/1/3/4/3/134384552/kujarow-sakuw.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/b7450b3d-fba9-44f7-977a-6d80ef8204bd/gezawilotuvuwepufatax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3594907d-3f0e-4cbf-a56e-202331384f69/how_to_work_dyson_dc28.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b32a5b-342d-4d71-bc63-758e8d81dc17/bill_of_exchange_definition_in_english.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_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 5528 bytes
SHA-256: 092654c4be9e15027f2b1da82732b4c3f1b6802bd958fd8bacf7afcb039733fa
font_01_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 10548 bytes
SHA-256: 86341dc71927952aa179f3888cfcc911b17a3fbc24a1be025450cc50b558861a