Malicious PDF — malware analysis report

Static analysis result for SHA-256 04af2e4cbe85336f…

MALICIOUS

PDF

82.1 KB Created: 2021-06-09 14:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 002908b8ae69fd9510a77f3bdd976281 SHA-1: c46b6a1b65c3a3e146b9f479552797d971d071d8 SHA-256: 04af2e4cbe85336fe8bac7168ef409a2167ef2dc448d2512afb2837c11c868bc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation attempt. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://leonvi.ru/123?utm_term=innisfil+weather+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374979/normal_602c393fefafd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454988/normal_5fe4b59474219.pdfIn PDF document text
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/lesiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477910/normal_605d1db9864bb.pdfIn PDF document text
    • https://pilumana.weebly.com/uploads/1/3/2/6/132683063/fawevejezanukiwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501989/normal_604d3e6211819.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/vufojadozutelos-fadimutun-bivafefexomut-nafad.pdfIn PDF document text
    • https://lidafuxabu.weebly.com/uploads/1/3/4/8/134891514/222c9b21d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530457/normal_600c98e78556a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fd174060d7c5.pdfIn PDF document text
    • https://rakomuditopag.weebly.com/uploads/1/3/4/7/134717505/jabukom_dorob_rigalelulunaji_lebajo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405925/normal_5fe5178bf0322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_60241209cac69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_605c10fbba1b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_6057cbb82a9c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480393/normal_6007ee62beda5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449392/normal_5fdee61691ea1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144460500/gilmour_pump_sprayer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81da16d4-b5ac-4a76-b4fd-2a45a143d753/mozuwifot.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/41380649869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2164ae51-815f-4242-b60c-fa2bf9a8878e/wekagififibolixozepamug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6073f19d-45e1-45ad-b435-d1e0ef998836/11892187429.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144873735/zuterewax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a93822-e672-4396-81e1-84b661ece238/what_time_is_little_fires_everywhere_on_hulu_tonight.pdfIn PDF document text
    • http://demopefo.pbworks.com/w/file/fetch/144601269/21252048671.pdfIn PDF document text
    • http://natetusiwuwo.pbworks.com/f/ordenar_oraciones_desordenadas_online.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_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 5020 bytes
SHA-256: c9359be7bcfc170be1f18a4f86f868eb876cdfcb45737ad694d77b28e3a08779
font_01_sfnt_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 10892 bytes
SHA-256: b661916fdfed306dc27c38110d3ec78444c460390f3637d0bc385b1c1d737576

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