Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fafb056f5fcf1b…

MALICIOUS

PDF

81.0 KB Created: 2021-03-08 01:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 3c8af8a0816685662733d8ac06bbb5dc SHA-1: befb5d102edffda0f2d59d62679c44f46601e1e7 SHA-256: c5fafb056f5fcf1b13fef0bd1c93e268e2627a834fff370616fab11ad9c371d8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to harmful content.

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://baarspo.ru/wix?keyword=no+jumping+on+the+bed+activities PDF link annotation
    • https://cdn.sqhk.co/wuvinudubuno/fM6CjjG/varosedigibubav.pdfIn PDF document text
    • http://academic-club.ru/637292372032nuny.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/hj2ifdA/83741624927.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/HCjg8jc/wikipedia_game_of_thrones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_6012b0b172223.pdfIn PDF document text
    • http://santaparker.store/7579348465h6t2k.pdfIn PDF document text
    • http://fitokaps.xyz/reporting_moderated_mediation_apacuul7.pdfIn PDF document text
    • http://bonusiotsbera.online/84523479049mtfrb.pdfIn PDF document text
    • http://you-bestshop.xyz/wizosezesogugar11nwt.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/iiniVot/53533352378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531523/normal_60044b003a3bd.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/ce1JNk7/vilaruzuvunofipufuxubi.pdfIn PDF document text
    • http://susurrus.space/530750760022v17d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419002/normal_603e99dc6958f.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/aOIJt8p/41360681407.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/jNgi1gd/38450174995.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/2bfd0a81-4a0f-46e6-b59a-e457ef735cca/how_many_carbs_in_a_taco_bell_power_menu_bowl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c30755-8dd1-4856-9e91-1b4cc7394f9a/overview_of_osi_reference_model_and_tcp_ip_protocol_suite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e09918-97a7-48da-977a-1a31429255c1/what_did_joe_keller_do.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_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 5604 bytes
SHA-256: b3dcb18d695b1245152b4ee9e3cf2a8ef98ec10170e9897d249c6f68008b6115
font_01_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 10540 bytes
SHA-256: bfec77fb4e302a35d676d70455195d67380b8ec0a2e708cffa775efe0b8910c9

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