Malicious PDF — malware analysis report

Static analysis result for SHA-256 087cce6f8eb3be34…

MALICIOUS

PDF

81.2 KB Created: 2021-05-13 10:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a8ad6dd4f01dc1fae8b7143d594178a8 SHA-1: 2c6e16cd639ec92fb13decde5561510373b5269d SHA-256: 087cce6f8eb3be34b61d407e481174852a6322f3860f481c4034789e7ecc8a3b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's likely a phishing or trojan delivery mechanism. The document contains a link farm with numerous external URLs, including one pointing to 'jottigo.ru', suggesting an attempt to redirect users to malicious content. The presence of a 'download button' lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/strik?utm_term=can+am+outlander+450+service+manual+pdf PDF link annotation
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/rugitazilunokuj.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/5326372.pdfIn PDF document text
    • https://liritetujom.weebly.com/uploads/1/3/5/3/135310948/550319.pdfIn PDF document text
    • http://bagadiwep.22web.org/black_boy_novel_book_review.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/convertir_archivos_a_word_gratis_en_espaol_en_linea.pdfIn PDF document text
    • http://gaxopuxa.iblogger.org/best_time_to_catch_squid_in_moreton_bay.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/32201967820.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/way_back_into_love_piano_sheet.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/966495.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/business_plan_for_online_shopping_website.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/vufexadawi.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/a_thousand_years_piano_sheet_music_free_download.pdfIn PDF document text
    • https://likobikumenaf.weebly.com/uploads/1/3/5/9/135961418/ridaka-vukegu.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/9a3e2be4.pdfIn PDF document text
    • https://zugexegepu.weebly.com/uploads/1/3/4/7/134740595/53861.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/21774235981.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/988b262f-025d-4d82-9bb8-74d135c22073/silent_knight_5104b.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/63876394658.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/55101384225.pdfIn PDF document text
    • http://zojifupazavigu.epizy.com/folding_workbench_plans.pdfIn PDF document text
    • http://rajafebinolug.epizy.com/68854201881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bdba8c-c7b2-477b-b409-403424371af9/digidesign_digi_002_rack_audio_interface.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_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 5620 bytes
SHA-256: f418c641e2ad322d2ab0c6a81c49bdad7ce652f63f46c83c55caed92c436a386
font_01_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 11052 bytes
SHA-256: 03a45326482c6493b54a9b2b106826ffe94fbfb95342d588877c36e15b145f0a