Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dc8e47d717e771…

MALICIOUS

PDF

73.6 KB Created: 2021-03-21 02:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a0885df38c4b2f1f214a20bf807becca SHA-1: 2c277be47ab73c2e40cc5d7026d2a77af668ac69 SHA-256: 21dc8e47d717e771ffc177cc6dfcc03286ee6216d9e5d855a7592c3bbe576c11
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with a significant portion pointing to link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the ML classification strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/wix?keyword=bronx+community+college+computer+science PDF link annotation
    • http://qqkaxes.xyz/lepexozls73.pdfIn PDF document text
    • https://cdn.sqhk.co/weretesa/Txqjg4w/90443327266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421780/normal_5fcae8c333f48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486201/normal_600678d12e458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402486/normal_5fc7e76812c10.pdfIn PDF document text
    • https://timelasabo.weebly.com/uploads/1/3/4/3/134345700/2461175.pdfIn PDF document text
    • https://cdn.sqhk.co/jorubili/YifAjju/smashburger_nutrition_brussel_sprouts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_6055f8a2233bb.pdfIn PDF document text
    • http://teachost.com/jazevirokorunowoydbib.pdfIn PDF document text
    • http://rodsfish.club/bavefupekagoxipivaj3t0.pdfIn PDF document text
    • http://umkatrade.ru/hess_law_feoscogfesco2grr3qe.pdfIn PDF document text
    • https://cdn.sqhk.co/sefedetorup/stOc1hh/10948784487.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/357803020b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c7499cc2-cc32-4ae7-81e5-6dd5d35e2fb6/behringer_xenyx_x1222usb_usb_driver_download.pdfIn PDF document text
    • http://bixerexexotepe.rf.gd/centralised_and_decentralised_curriculum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f025161-088c-4f3e-9aa9-742274c840da/dapobititejabajewaso.pdfIn PDF document text
    • http://mujelagikajuju.rf.gd/zugeketelejof.pdfIn PDF document text
    • http://funixeja.rf.gd/amelia_bedelia_books_level_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a00a82b-2619-43d0-a184-58b990b37b82/whats_in_the_keto_taco_at_el_pollo_loco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e14a49-6564-4fc5-ac6a-4538cdfb13bd/free_zombie_survival_games_for_pc_no_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 5144 bytes
SHA-256: d3527ca34b312b46986df59943c900e52011fa41f491a92b35d2a55fd5af0a62
font_01_sfnt_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 10400 bytes
SHA-256: 291f987a1459c4072f93645beaebee68c82eee60cbdf6ddba81f97e5faefbf97
font_02_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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