Malicious PDF — malware analysis report

Static analysis result for SHA-256 3faa4b986fdbb409…

MALICIOUS

PDF

74.1 KB Created: 2021-05-05 13:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ac002a510e363718f6eec3ca3c1ed922 SHA-1: b912688abb5b67faf1a5d49dc6de5355790d8c8c SHA-256: 3faa4b986fdbb4090415e40620e4a4aaaec87cdac014c5e5f8e8e09306a36758
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a significant number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=what+is+sister+quotes PDF link annotation
    • http://mokemowowove.mygamesonline.org/29602736985.pdfIn PDF document text
    • http://gevenukodujojov.getenjoyment.net/data_communication_and_networking_for_ibps_it_officer.pdfIn PDF document text
    • http://levojefozaloro.mywebcommunity.org/instrument_of_accession_of_jammu_and_kashmir_state.pdfIn PDF document text
    • https://vivenovexo.weebly.com/uploads/1/3/4/6/134695888/zerabogofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_6050ce5f92f34.pdfIn PDF document text
    • http://leftoutclub.com/94718276154pf5z6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454999/normal_5fd9ac0f094cd.pdfIn PDF document text
    • http://1xbet-football.fun/peak_secrets_from_the_new_science_of_expertise_kindlee9vz2.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/56325744321.pdfIn PDF document text
    • https://kozivusetusi.weebly.com/uploads/1/3/4/2/134234967/926412.pdfIn PDF document text
    • https://sawagifavemon.weebly.com/uploads/1/3/0/7/130775832/7392608.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/body_parts_exercises_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_3ca3b55c99764e878b3f3a5fcc157928.pdf?index=trueIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_7e049712ca2f475fbf6402b4e2512f25.pdf?index=trueIn PDF document text
    • http://wozitoso.atwebpages.com/vuvuveju.pdfIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_e6acb5711a924f1295aae14b1127fa32.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_0c226da8da0f4721a9525f9ced896fb9.pdf?index=trueIn 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_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 4880 bytes
SHA-256: 11555e3d13746ffecd464643a6f73c8d80afcb03fd9c6bb282a276530f6ffaf8
font_01_sfnt_off0000f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 10432 bytes
SHA-256: 2a4f67695764be8c2886e78c4e23c41059b8cca3a7d42976c3fe82a522e6f0b6

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