Malicious PDF — malware analysis report

Static analysis result for SHA-256 835eeb66401074f3…

MALICIOUS

PDF

84.8 KB Created: 2021-05-12 04:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f4053907adb80647bb1d7809ea2fb160 SHA-1: 473cd064761f7f5564708002d8281e0d413c2b67 SHA-256: 835eeb66401074f3f4ca6a31b53e208cfb093a6fc919a096f8d62fe8c07d83c1
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/wb?keyword=revolution%202020%20short%20book%20review PDF link annotation
    • http://fly-drive.online/top_notch_fundamentalsvy8oa.pdfIn PDF document text
    • http://leomannapov.com/how_to_complete_the_maiden_voyage_sea_of_thievespndqp.pdfIn PDF document text
    • http://jiludedo.iblogger.org/utilitarianism_theory_definition.pdfIn PDF document text
    • http://good-production20.site/what_qualifies_as_a_life_event_for_insurancevzwgj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5cd1f41d-f1a9-423d-9a3c-ebaf9eb2dc4d/ken_follett_books_pillars_of_the_earth_trilogy.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_acffa33301c54bfb9d1a78cdcb7ff389.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benuka/chess_tactics_pro_apk_free.pdfIn PDF document text
    • http://pebeminozari.epizy.com/abc_matching.pdfIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_b62141bcb6df49e6bfca167304500308.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jagux/boxuremojokumezamope.pdfIn PDF document text
    • http://bonilevugebenu.epizy.com/winchester_model_12_22_serial_number_dates.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/10461567691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa68074-5750-4816-bc8c-d1e6cdbe137b/exercises_for_bad_back_and_neck.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_deb9bb0f80eb4791a01c57d4f6d47c1c.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_26c4b5b01b0f4986b7e08c18acf4458f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b4a7c0-23e1-437a-bd78-04a1a733d98d/how_big_is_a_cordis.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/barbie_girl_song_djjohal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a5681a-eb66-4664-8e2c-3518965a47a0/siemens_thermostat_rdh10rf_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c08540-ae7d-4d9e-9f30-8294c97c3f7f/jexowubaluporimuveze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b2911d0-6ae9-4004-94b2-5da76d12d04b/mofuraxepalotesanerunizo.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/hardwell_bella_ciao_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db5a4e4-74bf-468a-b470-370d0a8fae7b/58139840368.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 5080 bytes
SHA-256: 08bf3367fd7e7b3ebe43a25392258eeaab6614398cc7013c7bc5b5189ceaab71
font_01_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 11272 bytes
SHA-256: 618b682ee55323a2c60088cd1e4a88a8e119004d1eda65bc24b62dc19b89da45
font_02_sfnt_off000137e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378