Malicious PDF — malware analysis report

Static analysis result for SHA-256 3947e0b8176d7d95…

MALICIOUS

PDF

93.4 KB Created: 2021-03-24 03:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 12827ce9ed7d4d51a51b58d583a35a68 SHA-1: 17eee4d305498e7a58ead560e21f51fcdaeb30b4 SHA-256: 3947e0b8176d7d95847a19de67495a47b7aa7ae18798a516ce9b99dc8fee85be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and content indicate it's designed to redirect users to these potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://golowaki.ru/123?utm_term=bass+boosted+car+songs PDF link annotation
    • https://cdn.sqhk.co/litopozuf/jge4Gic/switch_controller_adapter_xbox_360.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/w9idtjj/79345561886.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/B2egerS/zombie_gunship_survival_unlimited_gold.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/sjhggjc/fejasezim.pdfIn PDF document text
    • https://cdn.sqhk.co/gatavikap/NUihjeq/anime_face_maker_go_pro_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jelasusoved/0g16Dif/panda_pop_game_free_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413121/normal_5ff67c4324e79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_601dca00daabb.pdfIn PDF document text
    • http://wovobogawukepu.iblogger.org/5176114788.pdfIn PDF document text
    • http://www19216801.site/2017_pacifica_owners_manualc6umi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6014d7792ee35.pdfIn PDF document text
    • http://app-3null.com/brother_label_maker_will_not_turn_onwlcwz.pdfIn PDF document text
    • http://qqkaxes.xyz/car_insurance_cost_calculator_bcipk20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_604a5bbb1ce58.pdfIn PDF document text
    • http://roman-holidays.shop/41771794778ace57.pdfIn PDF document text
    • https://cdn.sqhk.co/gezubesekar/bCLwhhB/adjective_or_adverb_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiditorugap.epizy.com/linear_algebra_college_course_online.pdfIn PDF document text
    • http://nikirijokagaza.epizy.com/walusisapivepuso.pdfIn PDF document text
    • http://gajedimigifupet.epizy.com/itunes_software_for_laptop.pdfIn PDF document text
    • http://kunipotow.epizy.com/72106395769.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_off00012efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFC 5264 bytes
SHA-256: 401030ea00e20086800bd6fc30c7c85486248d96a6871ab920cd66f7ef929c02
font_01_sfnt_off000140e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E8 11596 bytes
SHA-256: 5a70c6074e859f4210f6a33276ed41ec0b19563717f320d23e5a869b92447dfc

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