Malicious PDF — malware analysis report

Static analysis result for SHA-256 895ddab6c738a207…

MALICIOUS

PDF

71.6 KB Created: 2021-03-14 08:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 93a2f336f01576a832793b64e53b7514 SHA-1: f9715ae9d884c5f3abc18ea5cecedd0e0a390b82 SHA-256: 895ddab6c738a2071b00e73f0e3bcf68f7205b7394f8cfeffa0622f848e9a36d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains text related to 'free generic scantron sheet' and is associated with a URL that appears to be a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=free+generic+scantron+sheet PDF link annotation
    • http://bivitajuteje.mypressonline.com/62495357971.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/daily_language_review_grade_2_ebook.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/33357635855.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/jeOZic8/munagexokojinuzovim.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/black__decker_hs80_handy_steamer_rice_cooker.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/rhfyaja/disneyland_monorail_game.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/english_conversation_book_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/1st_rank_raju_kannada_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9382c6-6fa6-45c3-b8c8-481dc1c841a4/ingles_basico_ghio_gratis.pdfIn PDF document text
    • http://tanonarimunal.myartsonline.com/75110767505.pdfIn PDF document text
    • http://tefegiru.rf.gd/tazadizafoxusulojari.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/58882551459.pdfIn PDF document text
    • http://toledufebemal.rf.gd/34166268510.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/camera_raw_filter_presets_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e76ce25-924a-4ddd-ac42-1364c082a9df/16414653830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b411a873-9758-4e5c-bb7f-fba0c18a8c39/85050884856.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_off0000cde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 4772 bytes
SHA-256: 72c41229664170162d5fa27a11c6dcf1b65a90bcd9f12fa9006736e4de4e8005
font_01_sfnt_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 10872 bytes
SHA-256: 16f7f5c30e439e525a63fa08186c516a7b75765c90bf9d35afa3068711f44d17
font_02_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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