Malicious PDF — malware analysis report

Static analysis result for SHA-256 908e2062bd2c01bd…

MALICIOUS

PDF

75.5 KB Created: 2021-06-05 01:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 679497584a49a43467debb5d618e31ee SHA-1: 07b0a39b76cfbddc11aba1b7db315f459dd1cc37 SHA-256: 908e2062bd2c01bd7db0b9da860bea82b047130657840398a6410b0d90c55df0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one notable URL being `https://wastran.ru/pbw?utm_term=weird+texas+laws+still+in+effect`. The presence of a large number of links, some on disposable hosting, suggests it may be used for SEO manipulation or to distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://wastran.ru/pbw?utm_term=weird+texas+laws+still+in+effect PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413004/normal_60115abd7fd08.pdfIn PDF document text
    • https://xelenupexom.weebly.com/uploads/1/3/4/4/134480667/611e4faf.pdfIn PDF document text
    • https://jezipupokegem.weebly.com/uploads/1/3/4/0/134042816/4b5efbc311d146e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_604e0ff5cf024.pdfIn PDF document text
    • https://mafopobivo.weebly.com/uploads/1/3/4/3/134322173/gazuje-lonake.pdfIn PDF document text
    • https://lipukafawo.weebly.com/uploads/1/3/4/3/134335084/datupakemagizo_zudoserefizaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_602e28f1b7e8f.pdfIn PDF document text
    • https://renunuvejo.weebly.com/uploads/1/3/4/7/134710344/4512869.pdfIn PDF document text
    • https://bogimejo.weebly.com/uploads/1/3/4/7/134713861/0e6ae28.pdfIn PDF document text
    • https://jaginozowelizuf.weebly.com/uploads/1/3/4/7/134729204/2664304.pdfIn PDF document text
    • https://saxonolofazejel.weebly.com/uploads/1/3/2/6/132681209/7f914d497ac901.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/a109994b-d7a9-4a5d-a605-fb1785a712fe/how_to_reset_garage_door_keypad_without_enter_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a85f06-09b0-479f-a8ce-cc8052936b0e/59021904092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347385b3-2c31-4a1c-8fd2-6829e2cd3b6e/gakiranagaj.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144632526/medicinal_plants_and_herbs_book.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/f/1787295231.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/w/file/fetch/144495339/as_vantagens_de_ser_invisvel_legendado_assistir_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c865507c-6c10-4167-9a23-60337a25d672/safety_glasses_over_glasses_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2045ed51-7061-4cc3-afe9-21dd542d247e/zogusebigijokajat.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144524250/sniper_3d_gun_shooter_apk_free_download.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_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 5188 bytes
SHA-256: e99825170e8adb5c137e67ff03870e5acbba576b0a97379da9e2b9b3a3a94af5
font_01_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 10784 bytes
SHA-256: 6f858a16e5b1b167991f2bc19bb579fcdbece8a4de29946f8202c4c72e3f1cd7