Malicious PDF — malware analysis report

Static analysis result for SHA-256 b753341e89d901e2…

MALICIOUS

PDF

72.3 KB Created: 2021-03-14 04:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6c6718099f31dbda73e0c52c47092463 SHA-1: ec5a5b7fcd7167960c9259c00775f04392fb0cdb SHA-256: b753341e89d901e298e885dd9be4fea3ba16a9d6c367457d96a348b913feeedc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/123?utm_term=millennium+bcp+particulares+app+android PDF link annotation
    • http://mitimewigupito.mypressonline.com/62365564558.pdfIn PDF document text
    • http://carbackseat.site/gibson_g_force_auto_tuner8ikq1.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/Hribwfi/don_t_forget_the_lyrics_app_store.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/17701327395.pdfIn PDF document text
    • http://dajobod.getenjoyment.net/among_the_betrayed_ending.pdfIn PDF document text
    • http://chestlune.online/capitulo_2a_answers_el_verbo_exactoqt8gk.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/giaighi/48882896114.pdfIn PDF document text
    • https://cdn.sqhk.co/sikudile/jfNT3ha/chicken_gun_mod_apk_1._7._20.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/iXU6jcI/99151734086.pdfIn PDF document text
    • http://kitoxise.iblogger.org/blackmagic_atem_television_studio_pro_hd_manual.pdfIn PDF document text
    • http://nomiwiturej.getenjoyment.net/47824118208.pdfIn PDF document text
    • http://dayzcommunity.info/hum_ko_man_ki_shakti_dena_shraddha_vizbu0.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/DAjgijZ/diy_prepper_food_buckets.pdfIn PDF document text
    • http://zinusefubowewet.22web.org/sikalid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jijuxomofa.epizy.com/when_to_turn_off_stability_control.pdfIn PDF document text
    • http://pomolado.epizy.com/pandoc_templates_location_windows.pdfIn PDF document text
    • http://koxosam.rf.gd/carbamate_protecting_group_formation.pdfIn PDF document text
    • http://ninadolubexur.rf.gd/calculus_limits_problems_and_solutions.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/the_secret_life_of_walter_mitty_picture_quotes.pdfIn PDF document text
    • http://vujiwexamofone.rf.gd/html_canvas_transform_tutorial.pdfIn PDF document text
    • http://wizigipixe.atwebpages.com/molar_ratio_worksheet_answer_key.pdfIn PDF document text
    • http://navuwarulugo.epizy.com/74621645675.pdfIn PDF document text
    • http://pusebirenox.myartsonline.com/the_crown_season_3_cast_imdb_princess_alice.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_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 5364 bytes
SHA-256: ee36a366416e6842fd449c17df4f514e72515b5d7567d7ed75e9a9d1e45d5c5d
font_01_sfnt_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 13196 bytes
SHA-256: 528f4b75a6f1c92ac48039613ad5795253370cd0c1526b29bab5f5619d63d9f4

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