Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0cace10bbb1fa3…

MALICIOUS

PDF

107.5 KB Created: 2021-05-15 04:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 40c50d769334fcecd65f4c03343e77f5 SHA-1: e7768a3cc302276c9a059f5b5d5d089f2865171b SHA-256: 4f0cace10bbb1fa322e33341fa49db80124708f6db0dc2889d792a1f1f842563
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=what+are+the+warriors+series+books+in+order PDF link annotation
    • https://cdn.sqhk.co/sidamebo/vy6ibjb/namojunilik.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/hijjWhi/final_fantasy_vii_remake_pc_emulator.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/criterion_related_validity.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/Vhgjbge/42578755587.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuvobu/Jgjpugi/1156752618.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/hbTjfhi/strike_ops_motorcycle_helmet.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/ejfPU7E/hill_climb_racing_best_vehicle_for_countryside.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/cgid3gd/96190824913.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/advanced_sports_nutrition_book.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/etibAgv/69917824069.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/ghERjiu/jon_runyan_tom_brady.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/9hihjbR/spider_man_running_games_online_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_518d2a7eb62f4914b2395afc3d2098dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5209257-20a5-4b31-9676-0012d6116902/why_england_slept_jfk.pdfIn PDF document text
    • https://8dea6f00-b35b-4e5f-9f5e-01d9eb130a9a.filesusr.com/ugd/6a8da5_6dcec3070c204b78bbb47d6da0889f90.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_9bcf8a96967d4993aececfa2bb34c1c8.pdf?index=trueIn PDF document text
    • http://senesijosezetu.myartsonline.com/book_of_mormon_central_2_nephi_31-33.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7f2b02-a67a-425c-aa52-b206eb0e93b1/namewarofesewunemazagalew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c30358e-7cef-4bbe-b47f-0576b2932312/what_is_considered_indirect_exposure_to_covid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e245407b-5383-42e2-98ce-337af455bc53/4205008244.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/86413087961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20dea354-867f-43c6-9203-1eaf8ce36ade/batawesewasik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac96a31b-d27f-4010-9531-224a86ed6c94/fonolozolebenepoxamedevem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/badd5c50-09fe-4a69-b23e-99c102c1ff44/why_is_there_no_season_2_of_the_night_manager.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_off000167f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167F7 5192 bytes
SHA-256: e01fb59c0a4ef7bf85e9478a8fe9f5e5dd993d7fc8661e6aacccb62dcac0d873
font_01_sfnt_off000179ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179AC 11060 bytes
SHA-256: 6b7f096fa1cc2a610463f01389090405b418ceaacdbe78eb80460507fc5db4e3