Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b7c65b4e6d92c0…

MALICIOUS

PDF

72.1 KB Created: 2021-04-06 00:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c5bd0ec20d62016c64c1d89ca7bd0f21 SHA-1: ee5bb9aed36d198cf37a0eca5bec05773fd6e2c4 SHA-256: c9b7c65b4e6d92c0affce1fd58eb337bc517d4fb35b8fe4dcfed7a630a6fd17c
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://lozipotod.ru/strik?utm_term=brother+printer+hl5370dw+troubleshooting PDF link annotation
    • https://cdn.sqhk.co/fezifenax/iWljfFx/video_call_all_in_one.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/ihU81hg/software_data_cable_for_windows_10_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/Fv1K5hg/blackjack_strategy_trainer_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/ieifhhx/snowball_drag_the_balls_in_a_snowball_fight.pdfIn PDF document text
    • https://cdn.sqhk.co/fowijuseziju/gjWjgwH/nascar_heat_mobile_mod_apk_3._1._8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_a84eddb1283445da8f4daf7f39a5418a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b57c581a-0dc3-4253-8081-04dadb48629c/logitech_ipad_keyboard_certain_keys_not_working.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_4102470f62f64cb89ab7e214d3ae13e5.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_063edfe6c6b945e6b2a1f9492498508f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/meludav/jubogedupinura.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/nodijezinirisad.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_50d4dcb986324e938e033ae94407d3ab.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_08a3611793404fdfb8a9b507d1c27ef5.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_a94d646b0d4049efb5094406e489eff7.pdf?index=trueIn PDF document text
    • http://sodowurivav.onlinewebshop.net/botany_question_paper_2020.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_3db4206936e44b269dd89cffefc4a603.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajezife/dudepopupisuzusis.pdfIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_af8676f794b54492ae2fd944e7c59e5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/814c21f2-6844-4ba3-9270-ff97b7492ce0/32246479459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404ccab8-2d75-4b3d-bd20-2f519ceea7e2/10280397779.pdfIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_bcd22f0f3b8e40ab99d581a3d46f945c.pdf?index=trueIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/intermediate_botany_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/how_to_change_gauges_on_sct_livewire_ts.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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 5800 bytes
SHA-256: 26cdb4695afafea92ecdbfd13bd3c02b1f3803851aecf5223fe271d0eacd05db
font_01_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 10700 bytes
SHA-256: 579a52564f5f4740815132174bb01dd3c6d356c5f252206631217e95b4e7116b