Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf07576fef2c6fad…

MALICIOUS

PDF

78.7 KB Created: 2021-06-07 10:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c85671691e9b8a0d1289d94e232e8d81 SHA-1: 5ec70548a4df994d94b0274d9ad14a33e9b5efdc SHA-256: cf07576fef2c6fad77d43da53b4dd161394039849c2d180abb013a746b72872e
166 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into downloading a password-protected archive, a common tactic to bypass security filters. The embedded URL points to a suspicious domain, likely serving as a lure or part of the distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/pbw?utm_term=livro+50+casos+cl%25C3%25ADnicos+em+fisioterapia+pdf PDF link annotation
    • https://jufigewadekuxo.weebly.com/uploads/1/3/1/4/131406441/961764.pdfIn PDF document text
    • https://linonorimezolup.weebly.com/uploads/1/3/7/5/137519838/bakav-pixowegibedu-madokipek-sidexu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_5fcd856314ec9.pdfIn PDF document text
    • https://zavodazokexa.weebly.com/uploads/1/3/4/6/134632977/b39843.pdfIn PDF document text
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/pibom.pdfIn PDF document text
    • https://fepexugoroba.weebly.com/uploads/1/3/4/4/134469665/4792158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_60242b15932ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_60079c9b224d5.pdfIn PDF document text
    • https://wilexezixokesu.weebly.com/uploads/1/3/4/7/134764798/3145537.pdfIn PDF document text
    • https://guzuwifaxad.weebly.com/uploads/1/3/4/0/134096987/35b176.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4470232/normal_60b1d990061b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://risuxujuvu.pbworks.com/f/can_you_use_a_dualshock_4_controller_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117122a9-612e-453a-8ae0-c5f390e20e60/witcher_books_vs_games_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09da7a2-fe3c-403e-91fa-c2bfa81c5c67/9272537610.pdfIn PDF document text
    • http://zixawedeg.pbworks.com/w/file/fetch/144644142/99425563211.pdfIn PDF document text
    • http://patimedudemu.pbworks.com/w/file/fetch/144701013/64319567026.pdfIn PDF document text
    • http://kusarolox.pbworks.com/f/poxobulonorituzas.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144532995/is_fortnite_free_on_pc_2020.pdfIn PDF document text
    • http://pajinap.pbworks.com/f/dan_brown_inferno_synopsis.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/f/gogimefukufaxog.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/w/file/fetch/144719799/18372383487.pdfIn PDF document text
    • http://najapenoz.pbworks.com/w/file/fetch/144619542/active_and_passive_voice_exercises_learn_cbse.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/fewolirabewotekezowesanaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053562b8-120d-4500-a522-b8d22e238275/medical_surgical_nursing_10th_edition_test_bank_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56726f23-308b-4511-bcbc-2d85f04a294c/dodge_ram_3500_parts_canada.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_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 5620 bytes
SHA-256: eb26bff95877863a8286714b923994ddb85907bc75df5f23fb9d453efffa6f6f
font_01_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 13136 bytes
SHA-256: 04ccc5e4cc3c14c5659d7fc20db6ec91b0db827209b27e9bc705577d9b8056b6

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