Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5042b87c5d6db00…

MALICIOUS

PDF

72.7 KB Created: 2021-02-16 01:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d0306b4dc4f3b5d8f5ff1845405e1143 SHA-1: b14f3ee732dc7ad939767101976d6dc66823ac97 SHA-256: b5042b87c5d6db002935b53a689201a0bab7302826c140d3bf7446e9411c3815
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=electricity+and+magnetism+worksheet PDF link annotation
    • https://cdn.sqhk.co/fosigigamef/Tpha1hd/osprey_complete_retro_plastic_mini_cruiser_skateboard.pdfIn PDF document text
    • http://kismykeitio.best/pexosapemuje9al4e.pdfIn PDF document text
    • http://chempion.coffee/chimera_tool_downloados8l6.pdfIn PDF document text
    • https://cdn.sqhk.co/vumatoxikom/jaNlhem/76030616478.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/61257623528t8c39.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/uwvheEe/game_creator_free_download.pdfIn PDF document text
    • http://igbusinessabouthelp.com/hku_summer_school_2019h6lu9.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/jhtjbjg/bimalodogo.pdfIn PDF document text
    • https://cdn.sqhk.co/poxirowo/eje5ehd/fruit_ninja_unblocked_download.pdfIn PDF document text
    • http://f13x.xyz/xepamuksn6q.pdfIn PDF document text
    • http://businesslinecenter.com/jabumuxoripolupunegugimeizzi.pdfIn PDF document text
    • http://perevod24-card2card.site/tumblr_for_pc_windows_10l4avp.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/jLiUihZ/tamil_worship_songs_guitar_chords.pdfIn PDF document text
    • http://zoosalon.org/2935513040ri13a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giduzorim.epizy.com/butinodokufutuzibijiseje.pdfIn PDF document text
    • http://gagokirabi.rf.gd/86763454613.pdfIn PDF document text
    • http://fegifujeviba.epizy.com/govuben.pdfIn PDF document text
    • http://residarifuwus.rf.gd/image_assets_android_example.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_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 5568 bytes
SHA-256: 272b4b6156290124b348fe5dacb52b057a98bc456210e4a76e5144ab6e237c6f
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 10524 bytes
SHA-256: c688e2506db114ffb951882a8e644d7d07a1f21d6321e7bf270c5c162192c7bc

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