Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c04c9836ea303f…

MALICIOUS

PDF

89.5 KB Created: 2021-06-01 11:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9482cabe6ceda60a7dbc299078e1d21a SHA-1: ead5502c3240a7a7ac4cad76b1c9af9e5438f107 SHA-256: 42c04c9836ea303f62d65715f11dec2bfe8fe8bbb6811f28836881292d6d2b8d
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, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/123?utm_term=viability+study+pdf PDF link annotation
    • https://xotukowigadane.weebly.com/uploads/1/3/4/6/134683058/7196781.pdfIn PDF document text
    • https://duguzimelape.weebly.com/uploads/1/3/4/6/134666192/forajarebu_tanovupir.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/xapudazel.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/9867401.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/jipimogetivofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425738/normal_5fe608e47e6bf.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/3692062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5fea32ff64494.pdfIn PDF document text
    • https://gosupafitowiru.weebly.com/uploads/1/3/4/6/134673249/dawigawet-palizaj-zujit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_603c0eaa86a61.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/6e320a6c-af81-476c-a6b1-1d9b0335fbec/60595968185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49307799-3e0f-4bc7-97ba-f49b99e49903/lily_collins_buch_unfiltered_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790c2d74-d848-4828-a993-3578284e9b7c/full_english_grammar_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3477cb85-134d-4132-917e-d8c3490db42a/what_are_the_elements_and_principles_of_sculpture.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144424767/what_are_the_different_types_of_intermolecular_forces_of_attraction_from_strongest_to_weakest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803214cd-2ddf-4ae5-abbb-bbaf8cb6b24a/duviwilozirizejuga.pdfIn PDF document text
    • http://kelivesas.pbworks.com/w/file/fetch/144442980/xuvonilojizuwipi.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_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 5148 bytes
SHA-256: 104590ceb4639f0330d49572dca82c5a4c0e368fcd87ffbb2a315bc115476cc5
font_01_sfnt_off000131de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DE 11480 bytes
SHA-256: 1c930176b0c4cb92cc15f7ab9542a0f8dbf9ebb40ad813ebacc01a76c29e4895

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