Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b42eaf93e13119d…

MALICIOUS

PDF

84.5 KB Created: 2021-03-09 00:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 09bdc3044e5744611bcc7b1145032881 SHA-1: ac5516968e37f9a6f127d231bbe9d498f7ec2389 SHA-256: 6b42eaf93e13119d383933b4fad00c66918995d36a11352fd19523746246dcfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/award?keyword=randomized+algorithms+tutorialspoint+pdf PDF link annotation
    • https://cdn.sqhk.co/jawuraxexije/jjXITje/super_wings_character_who_island.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/uWjdljZ/autumn_leaves_sheet_music_trumpet.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/what_is_the_most_classical_theories_of_crime_causation.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/96265789433.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/zunujamixiwisusedan.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/l1GoFgg/jegib.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/81347645014.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todetizos.epizy.com/7576585097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609bc825-d809-4bcb-a4c3-4509e8d6861e/how_to_get_gerudo_secret_club_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6c93af-66f5-42b1-b561-d1b1558b1c30/simple_present_wh_questions_exercises_with_answers.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_152fd6886a0445ee93e9dc4491f1e1bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6aa47e7-b4e6-4e19-9145-d791c2135fa6/what_is_the_best_bluetooth_grill_thermometer.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_730bd1ebd3e64dfe9ff6265dc96dad1c.pdf?index=trueIn PDF document text
    • http://xonukekavufimil.epizy.com/algebraic_identities_class_8_questions_and_answers.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_1286bc53a20f4603a05f21f5f002f66b.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_2383e031ead5440db2fa964e8e74593e.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_4ebe1eaaaaf0413e87486fdcf1746cda.pdf?index=trueIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/bakavelotukimezilasigi.pdfIn PDF document text
    • http://rovofupokunuda.rf.gd/wordly_wise_book_5_lesson_8_answers.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_c94b2877bfde40fa8ddb5b35ebcbadd2.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_b358c2bc343f4580920e8a4c1e39b362.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f34db69-4b50-4137-b551-ab3ea6bb2100/56760879050.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_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 5512 bytes
SHA-256: 248c7b5e22db0d749733b155e454dca582c267c690beb8b1cba5e576b953a238
font_01_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 11168 bytes
SHA-256: 558bc7c822c64da65e29186390437c2eb9bbe862f65d2f1bb87f5b99003faf44