Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1fc3349fd4d384…

MALICIOUS

PDF

103.6 KB Created: 2021-03-16 10:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5c004efa3017c6a99c66c0751e408f52 SHA-1: 493d33f676ef462a3856fda5f3c9630023669c1f SHA-256: 8b1fc3349fd4d384bb55b72082940c34c1718e7d32773193fb2906b1bb299009
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to 'ponafet.ru/strik'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://ponafet.ru/strik?utm_term=how+many+carbs+are+in+a+sonic+double+cheeseburger PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5ff8c7876be65.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/kieWCH8/are_there_cheats_for_farming_simulator_14_android.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/Rjex0I6/margherita_pizza_toppings_pizza_hut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373769/normal_6000b86a35207.pdfIn PDF document text
    • http://mewajofoguwuz.iblogger.org/what_does_asma_ul_husna_mean.pdfIn PDF document text
    • http://balizupi.iblogger.org/how_to_subscribe_with_twitch_prime_on_mobile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407057/normal_5fec439fdbc1e.pdfIn PDF document text
    • https://cdn.sqhk.co/salusasopuvi/Mhdyggh/vevipapizexowu.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/dheiahh/the_world_wars_episode_3_never_surrender.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/jeberinopo.pdfIn PDF document text
    • http://nidawijonag.rf.gd/bodenheimer_verbatim_reporting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae47f3b-669e-434c-bdd8-f0c38bc8a9c2/how_to_fix_preview_handler_for_vista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908b2bdd-b448-40af-a98e-43dbf6d74da1/sistema_endocrino_como_esta_conformado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb64d90-e71f-4620-889e-1818876f9e13/kevas.pdfIn PDF document text
    • http://xezeruv.epizy.com/toefl_reading_comprehension_book.pdfIn PDF document text
    • http://silapopo.epizy.com/ethiopian_flight_crash_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/nafawaf.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/urgot_unsealed_spellbook_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948e27b0-b3ba-4158-9d8c-bc66d1c77362/dell_2005fpw_driver.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A67 5648 bytes
SHA-256: e1cdf4d19df2253c2c4d48e125cd3e4f2ad0470dbd6f44bef2ddcb82f55ebbf9
font_01_sfnt_off00015d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7F 16344 bytes
SHA-256: 1ee41294021fc4a5d7896f0342b9d0156f102357cd46ae128029be83cbe39a51

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