Malicious PDF — malware analysis report

Static analysis result for SHA-256 595d77189497e331…

MALICIOUS

PDF

90.7 KB Created: 2021-03-23 08:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4502bf971894e15d913960726fd965e0 SHA-1: 9a48594b4de49d982bbb389ff5e9144eb2b5ee2d SHA-256: 595d77189497e3319eab0a98a02ff64e54939b8e57fb27425a70e0e122f530a4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://leonvi.ru/award?keyword=calculus+with+analytic+geometry+pdf', is likely part of this scheme to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://leonvi.ru/award?keyword=calculus+with+analytic+geometry+pdf PDF link annotation
    • https://bubunixijasebed.weebly.com/uploads/1/3/1/4/131407035/zarenuzifumakev_fexaruzam_wobalulezip.pdfIn PDF document text
    • https://kibinopojisetux.weebly.com/uploads/1/3/4/6/134662243/sivufamebufiv.pdfIn PDF document text
    • http://navaram.online/9965332294xepzl.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/spreadsheet_for_household_finances_ukpyz1t.pdfIn PDF document text
    • https://gigodetexopisi.weebly.com/uploads/1/3/4/6/134630538/lutiwuk_kakexuj_xesavu_dufozukokad.pdfIn PDF document text
    • https://laxepesijuniz.weebly.com/uploads/1/3/1/3/131383562/zubudiwagifa-rafiratazudo-diluvofapek.pdfIn PDF document text
    • https://busajivajikiguv.weebly.com/uploads/1/3/1/3/131384407/0e940b4.pdfIn PDF document text
    • http://websporizle3.com/skyrim_coldharbour_mod3si9i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_ee77eb81ad0c4c9984fd734e813056b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7dfa403-c14c-47bf-833b-0df70f8db32e/doxujogedufikosaxe.pdfIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_30b1533f293242d9bfddccaecb665050.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/011786f8-7b88-4ee0-815d-45efc8782f45/do_lock_pick_guns_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b02dad-e0cd-4d37-8dcc-3c059696d3b4/how_to_do_data_analysis_and_interpretation_in_excel_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2574ad58-846c-4f44-8c1b-8ae3debbd71c/89102841854.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_1c37caca61544491928cbadfd8e9cae9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81225648-61b1-44b6-bbe0-0cd28334ddf1/nikon_dx_55-200mm_1.4-5.6g_ed.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/delhi_university_south_campus_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/what_is_meant_by_digital_divide.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/bcmon_apk_monitor_mode.pdfIn PDF document text
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_ca10e50893054cf2bd7ab52c92c04b66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33a9aa7-565c-412e-953d-9d3508516155/zakuxomar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655f0386-8c11-431d-9eda-1e9f5cd51319/frigidaire_ultra_quiet_iii_parts_diagram.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_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 5668 bytes
SHA-256: 14ec85d8f741b0e59dff2a6ebceeb705c6f82e70b43a4081926944060b346a83
font_01_sfnt_off000135a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A4 11076 bytes
SHA-256: 42d15a8a0c231160e1963575583cf96af15f803e4558a66c3f24aa742a5f068c

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