Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8900b675d8327c2…

MALICIOUS

PDF

79.7 KB Created: 2021-03-25 13:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 95407968c149d8b0badab0cd3244615f SHA-1: 91071ac6b877975de3e07c7243524e5c90c80a96 SHA-256: d8900b675d8327c2a06497b07560c5cd00310bb41accfbd6988aa38e64cba908
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=what+is+qs+in+atrrs PDF link annotation
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/ledexubetiza.pdfIn PDF document text
    • http://budorasipugegib.22web.org/oxford_dictionary_english_to_tamil_download.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/83096096422.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/bafehdu/history_of_european_ideas_44_2.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/tijisakulibolu.pdfIn PDF document text
    • https://jafiwivejo.weebly.com/uploads/1/3/5/3/135305612/xomoxik_welaluwu_bimifijurasalil.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/g1jhhf5/sesatek.pdfIn PDF document text
    • https://zudamuberul.weebly.com/uploads/1/3/4/8/134854759/xifido-remize-vokozujezimori.pdfIn PDF document text
    • https://cdn.sqhk.co/fidapulano/eaa7eii/4659757387.pdfIn PDF document text
    • https://deminoki.weebly.com/uploads/1/3/5/3/135310913/4954221.pdfIn PDF document text
    • http://zatutajijiti.getenjoyment.net/atomic_theory.pdfIn PDF document text
    • http://zebisol.mypressonline.com/5721894919.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/nikon_coolpix_p610_price_in_bangladesh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosopipates.epizy.com/badlapur_full_movie_123mkv.pdfIn PDF document text
    • http://wagenugeti.epizy.com/tuxorigotelasines.pdfIn PDF document text
    • http://kediresij.epizy.com/20th_bluebook_citation.pdfIn PDF document text
    • http://kowelakava.rf.gd/eclipse_for_selenium_java.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/what_to_do_with_grape_jelly.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/33817554923.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_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 4880 bytes
SHA-256: ee4aa367805d3564b086170c2fde9ea98d96f360adec27aac4dde7be2761b47d
font_01_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 10856 bytes
SHA-256: 3a12004a9594e628f0ed171a1a0951e450097728f6f366f449c736cd78a71a6c

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