Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c91f2ec859de14…

MALICIOUS

PDF

69.6 KB Created: 2021-01-25 16:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9f11b3ed571e26d5112e396efb734a7a SHA-1: c5ed53448a4ce2a428b48a06662a3430092da86c SHA-256: 00c91f2ec859de148e0b6c983566e0827888f0b2bf680b6446e6033f22f29f43
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. ClamAV detection and ML classification further support its malicious nature, identifying it as a phishing trojan. The primary function appears to be directing users to potentially malicious or SEO-manipulated content hosted externally.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9545

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 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
  • 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://traffine.ru/aws?utm_term=algorithms+of+oppression+pdf PDF link annotation
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/7e8919.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/Mhdfjf5/10329739845.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/HpjiVhf/xufepubobadaros.pdfIn PDF document text
    • http://muldwych.com/aircraft_mechanic_mobile_alpq4g7.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/cn5RPih/guess_the_netflix_series_2020_melhores.pdfIn PDF document text
    • http://gbo.guru/traditions_100_board_games_box63swn.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/OSH7Sjf/top_likes_for_instagram_photo_splitter_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/9yFjh9Q/yandex_online_translation_english_to_russian.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/Xhjiejj/start_page_chrome_extension.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tetexabe.epizy.com/acestream_media_player_apk.pdfIn PDF document text
    • http://sirusuve.epizy.com/broiler_poultry_farming_book.pdfIn PDF document text
    • http://zoribele.epizy.com/truecaller_name_and_address.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/bobcat_331_excavator_parts_manual.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 5020 bytes
SHA-256: a7436530cea2263f9088e5596141bd79e925a809a83864b124ac1410d7fa5d22

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