Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e1e2ff546ac805…

MALICIOUS

PDF

85.0 KB Created: 2021-02-28 05:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cda57713d9be6c533839343b4519b8e4 SHA-1: 57df03f6c5c0c7ef70c23e7d3ad7e0ec5849b816 SHA-256: 83e1e2ff546ac805d406796a1126bad533540fcf7be50e8498388827999e96ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://seumenha.ru/123?utm_term=best+intro+to+philosophy+textbook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481528/normal_602440d92bac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5fe8550dabe9c.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/how_to_remove_whirlpool_french_door_freezer_drawer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453528/normal_6018ced85f884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_601bc3c386e5c.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/english_daily_words_in_hindi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/gifted_hands_movie_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/computer_algorithm_worksheets.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/gumugidojijopenevuvup.pdfIn PDF document text
    • http://taxisariwoboduz.epizy.com/bhaskar_oru_rascal_ringtone.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/daily_english_conversation_practice_by_topic.pdfIn PDF document text
    • http://fosoxubap.epizy.com/45087366178.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/57498325025.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/6159875365.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/the_blind_side_evolution_of_a_game_book_summary.pdfIn PDF document text
    • http://putesedesupelo.epizy.com/xutexoze.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/nih_laboratory_design_guidelines.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_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 5120 bytes
SHA-256: 19e6bb7dfc8636f9c727fd45a3b0e01efa48f9b2c5499f9967f0f0ce3ce9903b
font_01_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 10588 bytes
SHA-256: ab049acb426cefdaa2fc7ed1a9e5eb25b51353db407cc0326a1d797e5356f2b5