Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ca6d89f1b7c28d…

MALICIOUS

PDF

68.6 KB Created: 2021-04-06 00:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 10beeb4abae0197bba04854c0fc8ba93 SHA-1: 6fa26955e5e21c448d709be12d70629b8d60aef0 SHA-256: 19ca6d89f1b7c28dc468c552a1c062e85220d2ebf8ee9a64956ce144744b2e01
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting or unknown reputation domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=conexiones+workbook+answers PDF link annotation
    • http://lnstagramverifiedsbadgesforms.com/parc_de_la_villette_koolhaasqp390.pdfIn PDF document text
    • http://labincom-med.ru/how_to_change_transmission_fluid_and_filter_on_2005_ford_f15029zwo.pdfIn PDF document text
    • http://milanomoda-italy.site/acapella_music_sheetychbk.pdfIn PDF document text
    • http://umkatrade.ru/14475755325snhhv.pdfIn PDF document text
    • http://okrasote.info/kitumgbk7i.pdfIn PDF document text
    • http://dutuvowori.22web.org/52655092171.pdfIn PDF document text
    • http://liwitavazij.iblogger.org/gigokirez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/what_age_do_babies_play_with_playdough.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/what_ppe_is_required_on_a_construction_site.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f499c9b-d80e-411c-8cd0-0388f269ff4e/10612987192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da7e842b-045e-4e8e-9d9e-517034acc062/critical_race_theory_an_introduction_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea521ae-9da6-4d68-8c8b-0936ac792d39/89180994536.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/how_to_get_filthy_rich_in_rising_asia_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29fa1ef3-d730-4af8-a362-14760b05593f/52305233961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21914a1-ee26-4212-a71e-102e239c58cd/hp_probook_4530s_network_drivers_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/68893674348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb3a0d0a-b5fd-4ed6-8d54-f9993c9d0368/trig_bearing_word_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd69cdd-f932-4f99-b56d-cde4f26012d5/zuxununo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/840f5c3f-81c3-4632-82ab-de75be975230/garmin_nuvi_5000_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/xufusos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65850f87-2123-48dd-8ebc-f0cf3ade245e/olive_oil_formula_conditioner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e8b63ba-462c-4a15-8f71-956d684e7b25/ge_gas_dryer_timer_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d1ac14-0f36-492e-88ee-64850040294f/13908262196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6271ea-c6dc-4378-a8e0-7a2d63f3de5d/how_to_write_a_communication_analysis_paper.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_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 4916 bytes
SHA-256: 37abb55029f5dc6ea78c67657906b0a72e3464ecdf5f39eac83bdb377aa50785
font_01_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 9928 bytes
SHA-256: e4ef27d90f99ff76295b03ebcda7014c0d8b859bcc3087ad0fbee20381e5bb75