Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4a1415baf34df2…

MALICIOUS

PDF

82.5 KB Created: 2021-06-01 02:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d12bc9d4f8826c8f7c7790a0730594c3 SHA-1: 47cb95e0c13d9f0d753e7f5695fe74b9bf18fd1f SHA-256: 4d4a1415baf34df2f9f322644569c197569ba03f0bebf38da52d11d29e7b3721
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one primary URL pointing to 'https://mezovuduw.ru/123?utm_term=biographical+dictionary+of+film+pdf'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/123?utm_term=biographical+dictionary+of+film+pdf PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4492915/normal_60b4ea30e10f7.pdfIn PDF document text
    • https://selikiwomutarew.weebly.com/uploads/1/3/5/3/135329437/xelofa_pemive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373243/normal_5fde2ca6669d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_600e147374c9a.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/bebexog_jowamisukuda_jewatopidawepog_dutekakigaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_5fdbdf121fdc9.pdfIn PDF document text
    • https://jukusixod.weebly.com/uploads/1/3/1/4/131483076/xetiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd39f0033a55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusuwoxub.pbworks.com/f/penny_stocks_to_buy_robinhood_reddit.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/silabario_ingles_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3dbcd19-cbe5-472e-95fb-6e26bbefc418/hack_version_of_free_fire_for_android.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/parallel_and_perpendicular_lines_worksheet_answer_key_unit_3.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/street_dance_of_china_season_2_winner_mentor.pdfIn PDF document text
    • http://famukaser.pbworks.com/f/how_to_open_ge_stove_top.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/8_snf_kazanm_lme_ve_deerlendirme_snav_3_cevap_anahtar.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144416886/23364756158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681db3b5-b697-4749-a754-0feaf7f09295/11686209944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c83a18-3026-48ee-a7d2-a346d20f1833/25651033245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337e2d30-62ab-413d-9661-a5ae5c23ba04/nikon_p-tactical_223_rifle_scope_-_3x-9x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a2e1e3-027e-4c8f-8335-1e13693fde29/toro_powerlite_98cc_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c540c5f-6a2c-446b-b277-21c4174d7d77/how_do_i_know_if_my_glasses_fit_my_face.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144425055/desafio_del_amor_para_padres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21a4350-51db-4db9-93b9-c55fe490cef0/dumovejalipirara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f9bd7e-173e-4150-a21f-a8dbb512d194/58457251021.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_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 5540 bytes
SHA-256: 1862b653cffed96d8a63c6c045e09115394227454b923972d5185ab2947b55c1
font_01_sfnt_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 11560 bytes
SHA-256: a62c2bffda119f2106c70c2aa1a02b6490603098481cc7e43b8f3219cbfc8c62

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