Malicious PDF — malware analysis report

Static analysis result for SHA-256 83944e88f5ad42d7…

MALICIOUS

PDF

71.4 KB Created: 2021-03-22 20:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5e933d10afefc3414c0de24e29356582 SHA-1: e4fefb2be36693819363a5587c99801d96a98706 SHA-256: 83944e88f5ad42d7778d3b9e70e545482709d79f31d4ed5701886f9c12b070ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://cdn.sqhk.co/nexasolonit/IIetjcI/treasure_hunters_book_2.pdf In PDF document text
    • https://cdn.sqhk.co/widagawinud/ThZheaa/fight_club_movie_poster_template.pdfIn PDF document text
    • https://cdn.sqhk.co/budotedo/helidC5/tilifilixutitoxopulupeva.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/4hfbYJq/93861362503.pdfIn PDF document text
    • https://cdn.sqhk.co/luxanimev/hhgew2Y/xodefujesogiro.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/jjvzIji/yellow_apples_name.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/n4t4wXRn-MA/wb?keyword=eloquent%20javascript%203rd%20edition%20by%20marijn%20haverbekePDF link annotation
    • https://s3.amazonaws.com/musoxifuvitalo/adipec_2017_exhibitor_list.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_3131bb95677941e4b7edce6dfd173c0b.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_b1784ce524824c35af23f734857672ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c012fc9-4c76-40b4-be59-a4610c6f2fa0/the_non_designers_design_book_4th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6459565c-602c-4f58-a2a3-fece1768088e/workpro_chair_warranty_claim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e563286-1a6d-4dbe-baf9-928cfd2753f2/simple_present_easy_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2b23e5-ffb3-4855-b9c3-35e611a940c6/what_to_major_in_to_be_a_data_scientist.pdfIn PDF document text
    • http://soxewimudinozuk.epizy.com/codeware_compress_user_manual.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_11f103fce8c0463698ba3a913b4f6f1f.pdf?index=trueIn PDF document text
    • https://b4cee644-3d72-473d-9121-b6d1fce625ac.filesusr.com/ugd/be19e1_a5465d494d544bc08d462eb3fa28f5ff.pdf?index=trueIn PDF document text
    • http://lilorubetu.epizy.com/woninumereruwiwijatimir.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/how_to_print_and_cut_printable_vinyl.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/94323827111.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_b5057a85817342f5b521b5b565ce46db.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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 6004 bytes
SHA-256: 0a5e8b66e877c9a3f935ccea3f05c38a6b7eef0ff295ec3a423f4336c240b706
font_01_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10880 bytes
SHA-256: e881d7da03dc801068016cc1d54d7c6b7893cef529e0b6c6bdaf81901436afd4