Malicious PDF — malware analysis report

Static analysis result for SHA-256 914f3ac9e08655c1…

MALICIOUS

PDF

76.6 KB Created: 2020-12-03 23:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3b2d3d27d765521236236cf20257b3f2 SHA-1: 945ac09a484ecb94dbda06bc8246ee7a109bcd07 SHA-256: 914f3ac9e08655c1636dd388476c331b629bc48c2b94d9d3f7462572f252281e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata related to PDF generation and SEO terms, reinforcing the idea that the primary purpose is to drive traffic to external URLs. No scripts were extracted from this sample.

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 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.
  • 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://trafffi.ru/aws?utm_term=knowledge+encyclopedia+human+body+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386606/normal_5f910f5327c0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f8b0aea670ed.pdfIn PDF document text
    • https://zejabunu.weebly.com/uploads/1/3/4/7/134719965/92ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481409/normal_5fb5b4ca80b1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f87650c1c429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451221/normal_5fbdfc291e8eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_5fab2f9459dff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc2bb02085bf90c0e0909f1/t/5fc62cde9ee0f32b87269f53/1606823136430/set_list_maker_app_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/pexapabizukobajusela.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/44024811720.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/samsung_galaxy_s10_user_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/uniden_digital_answering_system_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/vixubinine.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/sensory_evaluation_of_food_quality.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/2d_game_tutorial_unity.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc781bf5c272238a81a8919/t/5fc7c9fca66cae07662717ee/1606928895049/konotosabiwi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 5496 bytes
SHA-256: 3855caf895cfd38f5e89d8abf9389c563baa70b64459c7cfa7b9057d48a6b61a
font_01_sfnt_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 11076 bytes
SHA-256: 1ac73fc8b7b352d16262f50921e55745f4a6246a2ea760fef74108c6b510b901
font_02_sfnt_off00011697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11697 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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