Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b22e29dfa988ad7…

MALICIOUS

PDF

80.7 KB Created: 2021-05-09 22:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a98e7e638640a7b1f2c3a2bc747946a0 SHA-1: 22abff66d657f447d4dc1880019c3cd9649fcd20 SHA-256: 1b22e29dfa988ad75945cddbb760527870df0de2604d6ae4370b89204b145d76
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The document body, though partially corrupted, contains a lure related to 'Painting kitchen cabinets with chalk paint' and references wkhtmltopdf, indicating it was likely generated programmatically to host malicious links. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=painting+kitchen+cabinets+with+chalk+paint PDF link annotation
    • http://lianhua.life/marketing_mix_promotion_worksheet2syyi.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/MjHUibF/56083164569.pdfIn PDF document text
    • http://demask.space/39723726713b5lpf.pdfIn PDF document text
    • http://ririzobe.medianewsonline.com/cengage_coordinate_geometry_quora.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/combinational_and_sequential_logic_circuits.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/eclerx_interview_questions_for_financial_analyst.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/august_month_current_affairs_in_tamil.pdfIn PDF document text
    • http://jewlgems.com/clash_of_statsmaifj.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/EIjcpjb/clash_royale_cards_by_arena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_2805b888dcfe4811a5245c5a48a60f3e.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_59148dc46a3a4f3caf9f1acefeea5cbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4c4d21-8b06-493f-a637-8b2fa411a18f/jizejijimarejaresuk.pdfIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_7d3345725881471aa96ca8eef4829cb6.pdf?index=trueIn PDF document text
    • http://teluroluxeterez.myartsonline.com/38163939832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ec4931-50aa-429a-8d9b-dd8e50c3f52e/replacement_ink_cartridges_for_dell_printer_v313w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10bc057-c5ba-4a56-873c-43d595c7ca74/american_megatrends_please_enter_setup_to_recover_bios_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b1ee99-16d8-4e32-b2b2-61ddeafa2658/how_to_program_a_genie_intellicode_garage_door_opener_remote.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_61e8a17af3ac4973a2d97cedb632f5fe.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_77ef63d29af14ab7895dc7a93a69e1d4.pdf?index=trueIn 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_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 5396 bytes
SHA-256: fa2df74dede41e2f2017477e79a7ce4386312a2620dfbc6b80c3eeaaec928399
font_01_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 11492 bytes
SHA-256: dff4471f2b3b723074cc873cb7bf8fc193650f78aeb11ab922e07e30e0126755

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