Malicious PDF — malware analysis report

Static analysis result for SHA-256 b811a66560dbc1fc…

MALICIOUS

PDF

76.5 KB Created: 2021-03-05 07:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7404acdf5343c1bd000c04d712721fc1 SHA-1: d8a78c12466bb7a0aa42c692c2e25a3dd45d9075 SHA-256: b811a66560dbc1fce0ef96c8a2119036605499f7171adfa6c25af316e8910cc7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=what+is+chemistry PDF link annotation
    • http://kifopelidito.mypressonline.com/90905810107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_600c98ab3e715.pdfIn PDF document text
    • http://geesecam.com/line_rider_mountain_king_gamex9jn5.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/mr_heater_big_buddy_dimensions.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/kenuzato.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/private_practice_cast_season_5_episode_12.pdfIn PDF document text
    • http://m-laskin.ru/maypole_battery_charger_mp74112_manual1k744.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/is_the_kaplan_gre_prep_course_worth_it.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/16194398832.pdfIn PDF document text
    • http://uscreditreport.info/kajurarubalexaredenofjv2jl.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/61495550129.pdfIn PDF document text
    • http://teksalon.xyz/the_god_who_is_there_carson0qwuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476301/normal_5fd655908188c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_5fd8705f7d8da.pdfIn PDF document text
    • http://esportzmlevent.com/2012_nissan_sentra_check_engine_light4x3wc.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/558b956d-ce10-43ec-a6bd-229c0e91574c/how_much_is_toyota_sienna_in_nigeria.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_2b8ca8220e1b48b687cce09aff7d933a.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_1827e7306c2e48fb9ee057f1e2fc9fcd.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_a43683428c82468292fb420fb791cb5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d3904c-da21-4fb5-b52c-908a5013b210/traductor_espaol_latin_vox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46d736e-b950-46f3-a90f-60bb8ec8a505/night_owl_security_cameras_instructions.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_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 5120 bytes
SHA-256: 8ba659350d41a815a28b455b5357f2345f1a8d65b3e09e426095149eb1b4a904
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 10700 bytes
SHA-256: bbb9ba4cce476f4994820ff3f1f408d1453b06e8eeeb443613d8dd35649ff29c

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