Malicious PDF — malware analysis report

Static analysis result for SHA-256 882d87c53523749f…

MALICIOUS

PDF

77.2 KB Created: 2021-03-05 17:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 50ba904350cabbdd861228184fb7beea SHA-1: 97abf190929ea5a0d9c824247f04c78b56259c69 SHA-256: 882d87c53523749f554f0c50a3862eab9169482e788e391f2c26551d3efc01ae
184 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and it contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically citing 'https://yafferge.ru/strik?utm_term=what%2527s+in+a+taco+bell+power+bowl'. Another heuristic identifies the PDF as a link farm on disposable hosting, with a sample URL being 'http://chestlune.online/basit_eitsizlikler_km_sorular_ssqwq15.pdf'. The document body, though heavily obfuscated, contains text that appears to be a lure related to a 'taco bell power bowl'.

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
  • 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 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=what%2527s+in+a+taco+bell+power+bowl In PDF document text
    • http://chestlune.online/basit_eitsizlikler_km_sorular_ssqwq15.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/asus_z97-a_m.2_sata.pdfIn PDF document text
    • http://manirixibuwoko.iblogger.org/jutet.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/best_pellet_stove_inserts_2020.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/nurse_salary_in_south_africa_per_year.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/what_alexa_commands_work_with_samsung_tv.pdfIn PDF document text
    • http://easterthjg.com/informacion_de_ballenas_jorobadas_en_inglesxpfbw.pdfIn PDF document text
    • http://bella24.xyz/sketchup_pro_2018_trial_userq9d7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf8ed88-679b-4f0a-8aae-199043d5bee1/zirale.pdfIn PDF document text
    • http://xirixedojaziw.epizy.com/kusutoxudo.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/basic_electronics_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4e6dde-fb1b-411f-969b-dfdd10416810/the_coaching_habit_questions.pdfIn PDF document text
    • http://jamurujitexezi.epizy.com/rune_pure_barrows_gloves_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c938ce37-d50a-4c60-842b-cce69685bacb/79224389781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4652a499-a0c0-419a-a6c4-a67eca75750e/rivixaximerimisape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e0b768-5621-46c5-afe8-24b46900bb32/magoguvanirefore.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/sanexed.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/24878604363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f37361d8-ef71-497b-9793-7b887d40af5d/95081648992.pdfIn PDF document text
    • http://gototura.myartsonline.com/wordly_wise_3000_book_4_lesson_3.pdfIn PDF document text
    • http://divimoxigorube.epizy.com/banarasi_babu_movie_song_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2981907e-03a8-49e8-8308-c8a99dd247ad/hotpoint_gas_stove_igniter_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/jspdf_autotable_header_image.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_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 5300 bytes
SHA-256: 189b4e11be926c7225ab9fb5a17c69ab425dbe3f86ea8a74f5efe17e1ac2097d
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 11672 bytes
SHA-256: 761ec2ca91f37c675abc0d1397462cd113f58d736334eefdbf5dca6623f4224f