Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cb0ec7c4333f6c…

MALICIOUS

PDF

69.9 KB Created: 2020-12-16 13:27:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f6e58989b29fefbcd3a34e2ede1253ed SHA-1: e8aad3b77e60281092a0a18a1e39650ff6eae9d7 SHA-256: 97cb0ec7c4333f6c8d8630c5a56dd36369b13eebc6c5b6461e07234ebbaf72a6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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://traffnew.ru/123?utm_term=danby+ac+unit+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475588/normal_5fcaf364bd17d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5fb9643ba1991.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/fasemumeve.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/zurirakesokovunugup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366399/normal_5fcee810b4582.pdfIn PDF document text
    • https://vepazigomopu.weebly.com/uploads/1/3/4/3/134398405/76604d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477863/normal_5fc145f0c80d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc294d0bda9c57a97c8e281/t/5fc372decb3e0f5771bc6155/1606644447166/maytag_ice_maker_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/47960945530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272870c2-83f8-43fc-a159-2b4e22341c22/39180615325.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/naforufovixawufizawike.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5add9f9866f3fd2f487b8/t/5fce9a8033343530ab9db8a9/1607375489596/world_of_kings_review_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85d519f-d64d-48d5-bdaf-e478f12c046b/80679546395.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_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 4912 bytes
SHA-256: d1c2748f5bee84961d4cd903c55c3f272e46de6938532358ee94b49b384c2108
font_01_sfnt_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 10516 bytes
SHA-256: 4b15aaa4336132f410e1289cb3f738e62334284d82e399395d44504371e10901

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