Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ea3917f7791183…

MALICIOUS

PDF

75.5 KB Created: 2021-02-14 05:50:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9857eab1f6e6feb42e7df15a7afa009a SHA-1: 59bbd72e1f00a3ef28c36bb3b60f4e870fa72e90 SHA-256: 25ea3917f779118347b0e44597d0ab648cba9d396ab872d5a1022851ba89f7de
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing lure. 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 a phishing or malware distribution campaign, likely initiated via spearphishing.

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://jottigo.ru/wix?keyword=genie+robert+clark+wiley PDF link annotation
    • http://nature-ital.space/bullet_journal_method_bookk995b.pdfIn PDF document text
    • http://expressday.online/sakawofawiwajutiwikaevv.pdfIn PDF document text
    • http://sibuvre.com/sbs_tv_program_guide_victoriaujt92.pdfIn PDF document text
    • https://cdn.sqhk.co/perajomipe/gg6tgiZ/65294538903.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/kQ9Oifs/rejodomefeb.pdfIn PDF document text
    • http://7gusevshop.space/mudukirozamalby3ic.pdfIn PDF document text
    • http://erogan24.website/puertas_y_puentes_ligeros_mod_para_mnlh4k.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/thdTLje/war_dragons_atlas_castle_finder.pdfIn PDF document text
    • http://stylecurtains.com/alphabet_grec_prononciationirbis.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/guardianes_de_la_galaxia_2_descargardhy3a.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/jghcghF/58062803706.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/abqgfjc/slotted_spoon_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/IF1ieig/23237244270.pdfIn PDF document text
    • http://vas-rem.ru/scentsy_buddy_packsfka4z.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/gjjigDx/prison_planet_game.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/79jhmAx/popular_galaxy_s10_s9_ringtones_top_100.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/kodipopujufipig/bang_bang_2014_full_movie_utorrent.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_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 5044 bytes
SHA-256: 9a2606399549c5280b14fb207f5b585089cbdc0547362f7e7e9173340b5ab40f
font_01_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 10424 bytes
SHA-256: c08613d9de38ba624acf791d144f170f5d38e407319589fdd50c1ab1be22b5ba

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