Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4607731ee5bf78…

MALICIOUS

PDF

81.2 KB Created: 2021-04-05 21:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 06cf0b6b8e43f40c34e0310a45dee396 SHA-1: 190ca795e0dbada9e4bd4335fbbf3ca140461eb1 SHA-256: 8d4607731ee5bf783ae9d32b58adeda2c0b5cad839367f47742d74547bff5efb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are associated with phishing heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to deliver a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/strik?utm_term=platicas+pre+bautismales+en+un+solo+dia+monterrey PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5fce92eb9f183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5fe92c0cb514b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_60156c613df93.pdfIn PDF document text
    • http://prodson.space/kazaporesazipb7sf.pdfIn PDF document text
    • http://prechambre.xyz/10403523194sxlrw.pdfIn PDF document text
    • http://tehnotop.site/57991189377uuvw7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_5fd824ceb74d7.pdfIn PDF document text
    • http://vezerfa.xyz/niwenanadafegapukezazejiermib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465010/normal_60690c9f38e4d.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/AhOgcji/spinach_dip_recipe_applebees.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/gjifhed/8_ball_pool_unblocked_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/8GgjrDy/toca_nature_application.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/da7d7912-788d-4687-9d41-5a8661fdebd5/harry_potter_book_6_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/phonemic_analysis_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd5d2ea7-eb58-486d-aa95-06d22cc125f8/emmanuels_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/628c0db8-1296-4575-b860-fe2ae4bd4cd4/how_do_you_reset_a_kindle_fire_back_to_factory_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eefb11a4-a34a-4cee-bab5-4ec0661906a1/traditions_buckhunter_pro_inline_.50_cal_muzzleloader_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/jutirubaxunojijuba.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/deliciously_ella_app_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16681934-310b-4d4d-a0b6-269eb066920a/97842949753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e881dca0-5d1b-46dc-af39-229e59fead2d/how_to_use_conair_extremesteam_handheld_fabric_steamer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/317a7575-3d5b-4e1f-a773-d74bdaa40864/kovagebugezafi.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_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 5464 bytes
SHA-256: c06276f7afac2420bc82967546374972ca52b2c8c2ea34c72529eefd8b3b8c46
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 11832 bytes
SHA-256: f082e8b6aa1ad33de5aa8d7d1f748643cffb506e3ea6b1b6f818b472fab8b669
font_02_sfnt_off00012dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19