Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e3a7af24cf6eac…

MALICIOUS

PDF

66.3 KB Created: 2021-02-24 22:30:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e186de58010c4d05c57aeeca660c8bf7 SHA-1: 74069fcd40e3177e2a19bbb1f90f10fa16312092 SHA-256: d0e3a7af24cf6eac14aea5e3a8975b168c34f77d41ace5d4b9e4285c4e9a5aeb
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malicious content. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, suggests a lure related to a health book chapter. No scripts were extracted, but the presence of external URIs and the link farm heuristic point to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=glencoe+health+book+chapter+5 PDF link annotation
    • https://cdn.sqhk.co/mekaxosur/dgjboif/leather_pants_fashion_nova.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/fEojf2B/54651034786.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/tUgfGgg/top_10_nearby_chat_apps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5fd1ce21d8e2b.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/f4iaCha/50th_birthday_cake_ideas_for_woman.pdfIn PDF document text
    • http://soul-felt.com/free_website_templates_expression_web_49n6hi.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/48266687609.pdfIn PDF document text
    • http://gelchlen.fun/games_to_play_indoors_with_no_equipmentb11uz.pdfIn PDF document text
    • http://persequenteamsohbet.com/java_8_stream_tutorialspointz6xww.pdfIn PDF document text
    • http://maddot.space/67095265639n98qi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/27910221949.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_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 5200 bytes
SHA-256: 832f3f75c8224eb09824e5e39e246d880e330978a53149f56dbe10a0b2350fa3
font_01_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 9656 bytes
SHA-256: c1f4714ae9a5d208ed301c17510daf9957a1de9ccd6ab6ede12052ca83e65f1a

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