Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d48c080d17ec41e…

MALICIOUS

PDF

122.8 KB Created: 2021-03-15 11:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f10d285d5f042255c13d139c75e37a32 SHA-1: 22768c9dd4047eaa4cd1036bf1dc5eeff06f61db SHA-256: 8d48c080d17ec41ed0a03f8abf37e24baff8a34cd847434b97a5e94da01673b7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, identified as a link farm for SEO purposes. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. The presence of external URIs and the link farm heuristic suggest the document is designed to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/123?utm_term=mysql+date+format+day+of+year PDF link annotation
    • http://housefashion.ru/dilosavonusarowada27kxa.pdfIn PDF document text
    • http://insta-sale.site/manual_caldera_baxiroca_novanox_24_24_f2eytp.pdfIn PDF document text
    • http://uablog.site/usa_today_subscription_services_vacation_holdwry20.pdfIn PDF document text
    • http://afracheat3.xyz/township_game_cheats_2020pw3ko.pdfIn PDF document text
    • http://lojotiwutorolad.22web.org/adaminaby_snow_report.pdfIn PDF document text
    • http://formulamoney.top/bizuvewuvoowknf.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/5ad2d830-3616-4ecd-8b9e-41e26e7868ee/delonghi_air_conditioner_blinking_hl.pdfIn PDF document text
    • http://mutomipana.rf.gd/realistic_rock_drum_method.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/java_formatter_code_eclipse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97cdde85-4c7b-404b-8162-04a62b8bdb12/super_mario_sunshine_walkthrough_book.pdfIn PDF document text
    • https://64db0a9d-d2b7-4705-beb9-75cca7f1d068.filesusr.com/ugd/4c6241_ab307e629d7d4170b4afac6da2c2ee59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb84693-146d-4137-97d8-3e84a73c287f/is_your_mama_a_llama_book_read_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be55a339-3eee-4c7a-a4dc-370665f72484/what_is_code_11_on_a_rheem_tankless_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61efa2f-8352-4348-9c6a-8335761afe44/oster_xl_toaster_oven_walmart.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_a9de8e4c95994155bee0b3e7558a1c05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/landlord_abandonment_notice_template_uk.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_cd50035f1f264909923b1feec5d97c6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d866e12-8dfc-4048-a175-05a6f0136c7c/what_handgun_do_army_rangers_use.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/which_brand_of_humidifier_is_the_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a5cbc4-3058-453f-8897-58144869a77c/english_learning_center.pdfIn PDF document text
    • https://1c3640e8-3530-4541-943d-4aa84fe9b526.filesusr.com/ugd/3e0cb9_e38baf302f864eea86a6493d21aa6b22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogipegi/85031201445.pdfIn PDF document text
    • http://muvaxuzuf.rf.gd/91483034791.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/vekuluzewujaxapojevenen.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_off0001a0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0BB 5284 bytes
SHA-256: be4cd1238547febda92163c0ff344fcf3a7f1d6c82619585b69d93af8175c0c0
font_01_sfnt_off0001b2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2B1 11976 bytes
SHA-256: 5e4cbb8b15199a8577ad55d47dff1b0be461a27d925e48183e5ba296fe0da2c2