Malicious PDF — malware analysis report

Static analysis result for SHA-256 b167630288508e3c…

MALICIOUS

PDF

70.8 KB Created: 2021-02-19 00:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: edbeab2f9c69a65b435cd55f374be674 SHA-1: b0b1cce84c18d52d1c48d22bd9842e3af06d6c46 SHA-256: b167630288508e3c94b6cddabae0ea2e04e2934dceb18ea7de53004884118795
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the document body, which contains references to 'wkhtmltopdf' and a misleading title, suggest an attempt to direct users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious redirection scheme.

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://bologen.ru/wix?keyword=not+nice+book+review PDF link annotation
    • http://edevletorg.com/xilogekixoliluretigudup3zt9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_6013afad8fb27.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/ij4Djgi/digital_classroom_management_software.pdfIn PDF document text
    • https://cdn.sqhk.co/tubefajuvolu/hjfgfxV/william_hill_golden_goal_advert.pdfIn PDF document text
    • http://redpandarecycling.com/visualization_guided_meditation_scripts3vo2.pdfIn PDF document text
    • http://harmony-market.ru/baby_soothing_sounds8umc7.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/ahkihN9/my_back_pages_wikipedia.pdfIn PDF document text
    • http://reduslim-italiaofficial.site/fimevuvibigaed7fg.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/geidx1Y/turbo_kit_350z_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_6011d1b41629b.pdfIn PDF document text
    • http://luminar2-download.xyz/pudavazizutejepi7tes.pdfIn PDF document text
    • http://rimka.xyz/poker_odds_calculator_excel_spreadsheetzodnu.pdfIn PDF document text
    • https://cdn.sqhk.co/mapibeze/hfFiejj/super_penguin_league_basketball_celebrity_ep_1.pdfIn PDF document text
    • http://ryduslim.website/teora_y_prctica_del_mantenimiento_industrial_avanzado_descargar0t5mf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412902/normal_5fed5cffc5213.pdfIn PDF document text
    • http://yazansoft.com/rezidezifofabagitvmivh.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/vuliwisuwig/figevatoro.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/55311692851.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/happy_birthday_song_punjabi_mp4_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/fundamentals_of_programming_language.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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 4700 bytes
SHA-256: ea23eb9438646339a7879df015d63da53d333c497e3dc5dae4a9c1cd18a6c600
font_01_sfnt_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 10480 bytes
SHA-256: eecadc611342246272005a449ddf84c238fae61212fac33d3b4c8baec8492216

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