Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d6e1d033b02fc0…

MALICIOUS

PDF

69.9 KB Created: 2021-02-26 00:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00b7eb2f08cbae518ee6522af64686f2 SHA-1: d10d7a8451af0fc1788036d61c8f2f0d5d4ad70e SHA-256: 88d6e1d033b02fc0540838086e0c1775278a032c1511630b3b5f1697364548ad
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a keyword search related to downloading a game guide, suggesting a phishing or malware distribution lure. The presence of a 'download button' heuristic further supports this, indicating a deceptive call to action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=zelda+breath+of+the+wild+guide+pdf+download PDF link annotation
    • https://cdn.sqhk.co/tinajugezepi/iccgedC/fast_racing_car_3d_simulator_apk.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/tai_chi_classes_near_me_for_seniors.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/before_the_flood_leonardo_dicaprio_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/HbyWdgi/perseverance_mars_arrival_date.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/guitar_grimoire_chord_scale_compatibility.pdfIn PDF document text
    • https://cdn.sqhk.co/nosilaxuziz/higjaNk/kerafufitazuv.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/how_to_start_husqvarna_350bt_blower.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mitefunigesito.rf.gd/1714036727.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/bomb_squad_pro_mod_apk_unlimited_tickets.pdfIn PDF document text
    • http://jinixoxugud.rf.gd/ivanti_community_reports.pdfIn PDF document text
    • http://ledigiluzazuvi.rf.gd/excel_vba_combobox_methods.pdfIn PDF document text
    • http://dilabopitomosif.epizy.com/miberu.pdfIn PDF document text
    • http://zemufobure.rf.gd/tizufob.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/zoligojirunekok.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/bsa_water_sports_merit_badge_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/common_legal_latin_phrases.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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 5316 bytes
SHA-256: f29c880960bf25209512d36b9ca349535e9ab196406a38a31050adbeebbba9dc
font_01_sfnt_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 10260 bytes
SHA-256: de6fee0b6c6000491c79054615aa0013365eab95979d8e56385da178c6156130

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