Malicious PDF — malware analysis report

Static analysis result for SHA-256 999f91e5b8fd0e61…

MALICIOUS

PDF

84.1 KB Created: 2021-03-09 20:20:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8177bb8ccbf95bf9cf92f6305675d420 SHA-1: 11d1804bf73e53c456bb3bb3062bea59511e8106 SHA-256: 999f91e5b8fd0e61ab66c1290e90bff1a9bf43714db8e87b2998b230767f2188
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous external URIs, many pointing to disposable hosting, and is identified as a link farm designed to obscure the ultimate download destination. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://resalured.ru/123?utm_term=free+terrarium+tv+apk+for+pc%252F+laptop PDF link annotation
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/tafejeganemudup_vesikup_weladopamakuw_relugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_603611acdfd98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427076/normal_60195778714c8.pdfIn PDF document text
    • https://xasirazabad.weebly.com/uploads/1/3/4/6/134699738/7cc4d.pdfIn PDF document text
    • https://sadavixiji.weebly.com/uploads/1/3/5/3/135333995/8274709.pdfIn PDF document text
    • https://titajava.weebly.com/uploads/1/3/4/0/134096001/tujuzapogiperuw.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/adobe_scan_digitalizador_de_ocr_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5ff25cd714a29.pdfIn PDF document text
    • https://vakugisup.weebly.com/uploads/1/3/0/7/130739558/kovetarupufevevisam.pdfIn PDF document text
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/xugewutexix.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/can_you_keep_a_secret_film_trailer_ita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_60205cbd2ae82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388276/normal_5fcfef863928d.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/fazivelop.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/zodererezuzuxi/aiag_fmea_4th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a069d6d-37c6-42ca-9634-2f05aa2592a0/libezaxidupaxevilafatuj.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/30714599398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f57a7f-e792-4bc8-b243-8b3be3801ba4/35360434968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a373de-a713-4c6b-9fbe-089912529c24/how_to_descale_my_lattissima_touch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f9c417-2062-44ae-9b74-b796a407c1b5/best_indian_non_veg_diet_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/tutemiwunufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707fc49b-3f80-4875-a651-41e000ffcfca/copleston_history_of_philosophy_9.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 5100 bytes
SHA-256: d96fe6aa7c172ba6a74d957878b1906e2bf089ef4cc6d81339df1f14e68b21c0
font_01_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 11068 bytes
SHA-256: 78f9589dd9d2bb83e76e0af0ddb2b8ed374f58f4d743358e6bc91b63ee101820
font_02_sfnt_off00012cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 16388 bytes
SHA-256: 534e44c921e8acb9c8e993207df297c85ca6c672af4c6174c05b3ca24a170572