Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb7823cfdcc60e9…

MALICIOUS

PDF

81.7 KB Created: 2021-04-03 12:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 063167072cb26a018356246c54e0ebb2 SHA-1: 65f9bcad7d111c60de17458b2d9e88adbb9e3a04 SHA-256: 6bb7823cfdcc60e9cf3b92a7f46811c5fd1c2ed9198ea70d24f680da80067da4
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=analysing+and+presenting+qualitative+data+pdf In PDF document text
    • http://luvatok.66ghz.com/free_paleo_diet_book.pdfIn PDF document text
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/72f59c3.pdfIn PDF document text
    • http://fevuworejefe.iblogger.org/baasha_full_movie_hd_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/soribivevi/gskBqhj/kalah_mancala_board_game.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/ghhhehi/lelegade.pdfIn PDF document text
    • http://vaxetopurorebi.iblogger.org/juloxofugisurulividipon.pdfIn PDF document text
    • https://dopukabaluboraj.weebly.com/uploads/1/3/4/4/134472891/gubub.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/ggWTgdY/zejasu.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/GItdvjb/jezumifuvajoxonepo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/914e7f6b-92bf-48e7-abaa-ea8f50dd32b9/king_lear_second_daughter_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a12ea2-6a6b-495a-b148-f9fa5582e119/tarewumisokusid.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/meninedobu.pdfIn PDF document text
    • http://komewubot.epizy.com/sample_certification_letter_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d288261d-df32-4145-aec6-c136ed6b44f5/where_is_sim_card_in_alcatel_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734f4c67-14ce-499f-af90-1ddabfc1be68/vapifefifebule.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/80441687987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1280c0a6-2fae-4d31-a143-c217aa424555/25911966646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a91d7b-ce78-41b9-8cc3-eb190a31394a/fundamentals_of_differential_equations_9th_edition_reddit.pdfIn PDF document text
    • http://manutejewugowol.rf.gd/dupefelidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8402e5d1-d05b-4640-a217-a574c57c56f1/dr_jekyll_and_mr_hyde_book_page_count.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b6e39b-67e7-4aef-a717-ae577eaf6dd4/fotavigojarezorudujepa.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/free_westinghouse_sewing_machine_type_j.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3e76a6-87b2-4f2c-92ee-d7fb259c0a90/63411391300.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/70882761851.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/cyclohexane_conformation_3d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306866b1-1e8d-47cc-818c-71d3ddb70eb0/74992015305.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_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 5484 bytes
SHA-256: 3eed8ae1b98f012551b8fe67d9c2b862b8caa92fe260c911357a1dcfc2a79833
font_01_sfnt_off000111f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 11588 bytes
SHA-256: d5b605b9b97dbd9fcdcc093ee318a815669bc2c00ab8cdbd1365ec41dca091be

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