Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c42df8e7d97ddfb…

MALICIOUS

PDF

76.7 KB Created: 2021-03-25 18:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5dd627e44e2eb2a1283b5831b52eb9b2 SHA-1: 727facd2770f75b98d84e9c2b8e9f01dca45399e SHA-256: 6c42df8e7d97ddfbec759fb5fc24dff7bc972b970b053d1755c0cab6589f41ed
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=sequence+text+structure+example+paragraph PDF link annotation
    • http://ozalupa.space/47966796794eam1y.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/aditya_hrudayam_lyrics_in_kannada.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/circumference_and_area_of_a_circle_notes.pdfIn PDF document text
    • http://vienvozvrat.site/rivizisegijamopd3vb.pdfIn PDF document text
    • http://gta-msk.ru/jopitexafijaxulomesipp4wu0.pdfIn PDF document text
    • http://jologedeb.getenjoyment.net/shreemad_bhagvad_gita_in_gujarati.pdfIn PDF document text
    • http://futajef.medianewsonline.com/humminbird_fish_finders.pdfIn PDF document text
    • http://merexazumebenag.medianewsonline.com/adenosina_ampola_bula.pdfIn PDF document text
    • http://teaitalis.space/libemowibowchykm.pdfIn PDF document text
    • http://appletopshop.ru/40962169942vui44.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/2e0f6df7-9e36-4cc5-9482-856f8f46293c/80850185900.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_4ece2b9942ff4d61a9aee8668a10d4bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0299b558-c851-4e0c-86ea-921e5575528d/52837647817.pdfIn PDF document text
    • http://zaxuzut.atwebpages.com/non_alcoholic_beverages_recipes.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_7c182dc2cbe94997bf549ba85bed2705.pdf?index=trueIn PDF document text
    • http://widepidaba.atwebpages.com/installation_camera_ip.pdfIn PDF document text
    • http://wofavum.myartsonline.com/37659642043.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/zarugafimabapafagoxevofav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd62fdc9-225d-4c07-92d6-5644c6759b2c/pufefip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b7cad78-0881-4813-9d11-ee92d8505be3/bopojipi.pdfIn PDF document text
    • http://gemovimuwopete.atwebpages.com/yaseen_sharif_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69896250-15cf-43cc-a9d6-8fbb7d81f1db/81587008283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a56e314-f29e-45aa-9f8d-20810e2c6113/11326311563.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_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 5644 bytes
SHA-256: 649c5ba383de53b9435e25557bd1a47d29baae5460ed03c911fa2df851301d9b
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 10872 bytes
SHA-256: 14e7f70be2b57c67efc32f9060bd6456475cdca95452312dd73763262c53c1de