Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34785831c86f6d5…

MALICIOUS

PDF

75.2 KB Created: 2021-05-28 06:39:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: da3cc9514847a40641042ebc4221754f SHA-1: ef14db1fa3fe3cfeac24f851fb47f580f833af4d SHA-256: c34785831c86f6d58e44eb0e7751c648136d60951d9eaf351a6d1bd804c4202c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://kuzutuzo.ru/123?utm_term=candy+crush+hack+apk+ios, indicates a potential lure for users searching for hacks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

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 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://kuzutuzo.ru/123?utm_term=candy+crush+hack+apk+ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485176/normal_602823eda53b2.pdfIn PDF document text
    • https://garixapevawena.weebly.com/uploads/1/3/4/4/134495328/monoseseladegi.pdfIn PDF document text
    • https://josapepukixo.weebly.com/uploads/1/3/1/3/131384602/82aed10d.pdfIn PDF document text
    • https://mipurilor.weebly.com/uploads/1/3/1/0/131071035/defividadepe-pugivux-taneli-tiwazobukutaziv.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/f0190fcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470224/normal_5ff9dccce3f54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405409/normal_5ff9499b3bd80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_6063dab24f45e.pdfIn PDF document text
    • https://kagukemo.weebly.com/uploads/1/3/4/8/134884413/lezelobawimufax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5fc6cc1072636.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/suwuwat_tujuxazuwawotol.pdfIn PDF document text
    • https://vegivuben.weebly.com/uploads/1/3/4/6/134660922/xalumilesifo_dogozugato_lerexikopaxo.pdfIn PDF document text
    • https://rawitexebava.weebly.com/uploads/1/3/4/4/134487877/lorenuxaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_60288f76d345b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_6067f6952f301.pdfIn PDF document text
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/48a862fbd.pdfIn PDF document text
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/rukixag-bepina-vuxofuzarav-xarubasamonaji.pdfIn PDF document text
    • https://teribizekejuxes.weebly.com/uploads/1/3/5/3/135391999/500446.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/10ff0486fa224.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/3f230587-0a26-4d3e-90d0-8661aabba257/what_is_the_best_hot_water_tank_to_buy_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab760bb-7ae1-48af-8190-11e230ccaed4/the_god_who_is_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd3fdb7-c245-4b8c-9bd7-20c0ed918d8e/how_long_does_it_take_for_nvc_to_process_approved_i_130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46e8a96-244b-41ad-bb4a-c327d68ea54f/fuxofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134efe3c-ed42-4e2a-a07e-90fc3ce20e2a/euro_truck_simulator_2_nasil_indirilir_salam_indir.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_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 5200 bytes
SHA-256: 378c5f36eb104afd02d97ab0ed29291190a43d4c50296a9b1d073a5a4eb09cd4
font_01_sfnt_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 10648 bytes
SHA-256: eeb618c802b0e33f14773a468c6748d5bbe6b46ba1d1f307fc68389742ecb758