Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e4f43ad5673d73…

MALICIOUS

PDF

68.3 KB Created: 2021-01-25 03:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 01de8b37718ecf56865e22eaac6f3287 SHA-1: 3e458e0a3f2a408742d6a0f92e53c36080452142 SHA-256: c6e4f43ad5673d73cda31176dc179add88d4dee94d9a944ec7e2c56b6c577552
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable domains and subdomains, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://trafffi.ru/123?utm_term=geometry+chapter+5+review+worksheet PDF link annotation
    • https://cdn.sqhk.co/pijuvedozuw/uD57ihz/64463981320.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/ibxhbij/talisman_board_game_4th_edition_expansions.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/tUvWwhh/nojimolim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421056/normal_60009f00f3be8.pdfIn PDF document text
    • http://afracheat8.xyz/delasikijaraxetweax.pdfIn PDF document text
    • http://difuwikikum.iblogger.org/company_logo_design_free_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407331/normal_5ff187a41a118.pdfIn PDF document text
    • http://bitjoms.xyz/18351764720hjs57.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/iciajd4/minecraft_rlcraft_dragon_treat.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/fixofa.pdfIn PDF document text
    • http://erkutungotu.com/roblox_toys_amazon_prime5prv5.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/ampere_meter_analog_2auhdx3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401716/normal_5fda78399fd8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5ff9bb336b04e.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/tozozewini.pdfIn PDF document text
    • http://osthondroz.com/best_likes_for_instagram_freebclji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakewexapenox.epizy.com/historical_dictionary_of_ancient_egypt.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_off0000caad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 5616 bytes
SHA-256: b3cf22b4228d67c157c1dc56e36db1f370f7139d6d9194924eea01ffd5e8b81a
font_01_sfnt_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 11836 bytes
SHA-256: 79225a3c61ed0fd3410797258e6e2b618dcdde67c2cdfa839b911d3959cb32a0

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