Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f13cac7a05700a1…

MALICIOUS

PDF

80.0 KB Created: 2021-03-01 14:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 95e0480cf6413d98145bf59f5d308d34 SHA-1: 12eed186b34e59a5abfbd74738237ca75fe75370 SHA-256: 6f13cac7a05700a1416df4d5a661b40b7e77c58c1d030bf6af24dca679563cf8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which are disposable hosting services. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=the+book+thief+cast+liesel PDF link annotation
    • https://lojedakefedo.weebly.com/uploads/1/3/4/7/134743006/nozubuselegelazola.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480145/normal_5ff525d5f23ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499622/normal_5fcd34e407a5a.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/leweg.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/7Yjheif/72924422941.pdfIn PDF document text
    • https://viwetefebelogup.weebly.com/uploads/1/3/1/8/131857445/1846868.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/WUji3jj/david_s_model_of_strategic_management_process.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/zozovofirema.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/EZhhFd2/child_development_learning_domains.pdfIn PDF document text
    • https://poxejoretojav.weebly.com/uploads/1/3/4/7/134740271/tetiwujejojuwan.pdfIn PDF document text
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/409c36a.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/18773216255.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/magedupavonoduduzifidazep.pdfIn PDF document text
    • https://wuviwozerax.weebly.com/uploads/1/3/4/2/134266003/6324924.pdfIn PDF document text
    • https://midubumiw.weebly.com/uploads/1/3/5/9/135989619/juwolorepenukil-kasabexi-fudazere.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/conversational_english_topics.pdfIn PDF document text
    • http://bejitepirisobi.epizy.com/trials_of_apollo_book_2_free_download_weebly.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_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 5028 bytes
SHA-256: f6faea46b505864d57bf7b8ee5b8d2e78034c40e3f82924f8910a3fb07381c55
font_01_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 11440 bytes
SHA-256: d24ffa65d400cc7ea9b88d7b3632038b9e3e2b5765f9c0d76afa31db07a83239

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