Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e8cf02239cf1f2…

MALICIOUS

PDF

94.0 KB Created: 2021-02-12 04:14:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7fe9af9e50364c7e415d68f5898bc3d4 SHA-1: 75c18b8520a79ec28d20b483e7798581ad250de8 SHA-256: 23e8cf02239cf1f25ca329dd94790984b7e5ac851a8eedcfdde870ce71c6a28e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, disguised as a voter guide. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and a link farm heuristic further supports this, suggesting an attempt to redirect users to malicious content.

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://druttle.ru/wix?keyword=clark+county+nevada+voter+guide PDF link annotation
    • https://cdn.sqhk.co/mepetiruzi/7aiijew/onedrive_not_syncing_android.pdfIn PDF document text
    • http://itchia.space/kololum1137e.pdfIn PDF document text
    • http://robinmani.site/6002683236xb8ff.pdfIn PDF document text
    • http://regsen.website/40554444723wm6sq.pdfIn PDF document text
    • http://weex.info/1389796806mu5o7.pdfIn PDF document text
    • http://moviesaddaa.online/photodex_proshow_gold_6.0.3397_activator-rndd31uan.pdfIn PDF document text
    • http://premiumpornclips.com/deadlight_trophy_guide_and_roadmapdmwo0.pdfIn PDF document text
    • http://geniusenglish.space/jotofolojivoteffk9rz.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/iCAgijb/cnc_simulator_free_android.pdfIn PDF document text
    • http://parhelifrl.space/burger_king_coupons_bis_junibq4uy.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/jT1gegq/derabofoxovoroso.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/1ihhfjc/ronivorawikagikej.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/jacaranda_fm_playlist_freeca1or.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_6016e29d51851.pdfIn PDF document text
    • http://zdorovienashevse.xyz/equivalent_ratios_6th_gradeet33r.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/remuv/11774169072.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/51505197297.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/89504914558.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/timez.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_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 5060 bytes
SHA-256: 1908d5af466e5ff9c5ada567d27a9b36e075d3ac25024d5e5205344e8314667e
font_01_sfnt_off0001370d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370D 10904 bytes
SHA-256: 163f18ad1b1e21944c3fb199a81a93cce0c81670ee9dfdc46f946a942e732d87
font_02_sfnt_off00015c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C39 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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