Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00cfc7a2d47dfd4…

MALICIOUS

PDF

79.1 KB Created: 2021-03-20 10:29:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5560701cf7789f12662b2ebc9b870efa SHA-1: be1f827e60b848a1886271246452d881320fbc1d SHA-256: a00cfc7a2d47dfd490228033417e5739387e25dd73d946a365dd8b263de76d2d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a network of links. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://bologen.ru/strik?utm_term=uc+berkeley+personal+history+statement+sample PDF link annotation
    • https://gisudilepa.weebly.com/uploads/1/3/5/3/135346020/vipuxitevuwu-kosexisaxi.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/ableton_live_10_keyboard_shortcuts.pdfIn PDF document text
    • http://xirapanagix.getenjoyment.net/taj_mahal_information_in_urdu.pdfIn PDF document text
    • https://rupuleda.weebly.com/uploads/1/3/6/0/136002844/7a900c.pdfIn PDF document text
    • https://powinategirax.weebly.com/uploads/1/3/4/7/134736766/7278234.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hI1IIqe/direct_express_card_money_transfer.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/danby_window_air_conditioner_-_6000_btu_-_white.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/fegdljc/amazon_prime_left_handed_golf_clubs.pdfIn PDF document text
    • https://garowowo.weebly.com/uploads/1/3/6/0/136033653/a6313.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403680/normal_5ff3850b8e673.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/jfxhaSk/bikipudadexezazexib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5ffa35151a11e.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/5goTjii/71896395440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_603ed5dabf2db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_60438a359be66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_60119e9182237.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_1fb1cdd0ff824520a4af53c644f63e05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3007cc82-bb95-44a2-9784-1c4ccb16c14c/corporate_finance_institute_certification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb923aad-d17b-4b2c-94b7-de91ffd7dee7/37124700810.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/71409439444.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_0051cc612e0c44bdba2e89b8777603f8.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_e60e6157d57745cfb135781a987c994e.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_21b5b788fa374bf19dc373f107184324.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_9c8a289f8d07422cb121f87750b11554.pdf?index=trueIn PDF document text
    • http://pilejifizodan.onlinewebshop.net/learning_disabilities_handbook.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_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 5468 bytes
SHA-256: af12450fa5cce4f51330d05673f5dbdefbac73ef1d805e7e9b9222b126bc7016
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 10568 bytes
SHA-256: f73ccc7a1e3dc651dbe2077d3d82c62a355bc46e103b7cad8b728a1262c9a9bf

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