Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3ff5a323b97d20…

MALICIOUS

PDF

79.2 KB Created: 2021-03-05 17:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8f6653377a75c3a56ad3ddb1ce0988ed SHA-1: d87485e51bfb4546221fa76915234f9f2a2cc2c1 SHA-256: 0d3ff5a323b97d20ffc8b5aafb52424f193ceafbd2a00fcd9a7ceb682268ac35
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many of which point to disposable domains and some are associated with known malicious redirectors. The primary function appears to be directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=top+10+international+news+agencies In PDF document text
    • https://rovufeku.weebly.com/uploads/1/3/4/6/134636625/b3e65d6ec5.pdfIn PDF document text
    • http://wdd13.ru/how_old_is_ahsoka_tanozeztb.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/78524850428.pdfIn PDF document text
    • http://flowerport.store/do_you_have_to_warp_in_the_game_troubleivr44.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/VggcOhe/best_black_men_s_fade_haircuts_2019.pdfIn PDF document text
    • http://idealicaufficiale.website/whistler_975_radar_detector_instructionsfqywg.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/gfjhqII/31415444031.pdfIn PDF document text
    • http://mebel-albero.ru/58239666251xsmga.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/c_language_basics_ppt_free_download.pdfIn PDF document text
    • http://com-connexion.xyz/jezalolakelavoxiramer0mnq.pdfIn PDF document text
    • https://fopizute.weebly.com/uploads/1/3/4/3/134315067/soxesakovogitedam.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/gjgjdMq/adobe_photoshop_camera_app_ios.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/dell_inspiron_3520_original_battery_price.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/fFjb7jd/norse_god_of_battle_crossword.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxolavomuzo.myartsonline.com/how_to_insert_text_in_pictures_ms_word.pdfIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_9eb36dd94b904201a4a2e3d686535f8d.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_13eda23fe130413586844e0eca1a9ae2.pdf?index=trueIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_4ab3785a84264b469df7135bc7c964b2.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_d254a79ab59e4f4d8da79eeefa7b0285.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_77e3483145f540a88496f623b84f684f.pdf?index=trueIn PDF document text
    • http://molujafit.atwebpages.com/63659158912.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_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 5336 bytes
SHA-256: 79f61e8b61df2188457b9c1dae07747b680eafb940f70258d1591cb1284f6776
font_01_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 11296 bytes
SHA-256: 9783da6cc962e155adc485696e4dee12ea18d69fbd662c9595ba041efb2fd6cf