Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39d8064ce6f78f2…

MALICIOUS

PDF

83.3 KB Created: 2021-03-16 11:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 34db6c125cb2ea931200d9b600b83574 SHA-1: 9a07fdba95a8660755baed1464d2080729a61b9d SHA-256: c39d8064ce6f78f2c35388030f5fc845610d0d9f40f6f8f2cf3a9e7dfc35dd99
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=search+scanned+pdf+mac PDF link annotation
    • http://duwosolutanuz.mypressonline.com/23654853982.pdfIn PDF document text
    • https://mopepeserowote.weebly.com/uploads/1/3/4/6/134621402/vagururi-wuviwurawal-padobofodapagej-tigagefor.pdfIn PDF document text
    • http://rijexofugovu.medianewsonline.com/kexetuzabotuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_60212928b9306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401696/normal_60032b6e80ca6.pdfIn PDF document text
    • http://xorimomupajo.scienceontheweb.net/are_lawn_mower_blades_universal.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/atheist_books_in_malayalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466661/normal_604f7d4897f6b.pdfIn PDF document text
    • http://resapus.scienceontheweb.net/42188491103.pdfIn PDF document text
    • https://guxuxexor.weebly.com/uploads/1/3/0/7/130775085/vuwifes-wugedijunegesox-badexuperanedo.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/juterajojitogunu.pdfIn PDF document text
    • https://faxororawanemo.weebly.com/uploads/1/3/4/2/134235350/rulugur-bexim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c4f2ea-f146-4971-92d9-6a8baf144766/67975626084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3508080a-96e3-40dc-beb1-d4d2e30f04a8/lijoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85518fb9-611e-49cf-929e-a2aae8f5548a/77537286963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652e8f30-b1a7-41cb-aaaf-bdded7406aef/kirikusifidakivifazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43d71bf-33eb-48e9-8d29-49d55b7c44d2/rudifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21102287-ed8a-4fbc-be13-ec59b45f3c08/is_the_revenant_accurate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962bd311-5e3a-4309-9df9-696c005a7c23/juluwafatenil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c068bc65-0c1b-4b7f-86db-17e86afb2a9e/brother_cs6000i_for_sale_philippines.pdfIn PDF document text
    • http://jazopizebe.atwebpages.com/attainment_test.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_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 5464 bytes
SHA-256: dde2f9776a4b97beec5419ae9d461218dfb170865bdfa627a1987ee72643eed7
font_01_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 11260 bytes
SHA-256: 5658e5bf21e649a8cb337f523f54fe40147dd62935da469bfaa348b895a0341c

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