Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41dccd4a53620ab…

MALICIOUS

PDF

71.1 KB Created: 2021-03-11 04:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 86da18ae9e4cc71f6453289677886b59 SHA-1: 4474ae7f7d3c0273e0a94b4d2251c58ccfb5be89 SHA-256: a41dccd4a53620ab33f5d51326d15606253ed5ccb5231e8b904616450065fa9d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bologen.ru/wix?keyword=trane+comfortlink+ii+xl1050+manual PDF link annotation
    • https://cdn.sqhk.co/samekikogeri/DjccihR/85695448944.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/ig0hafA/pizzeria_duetto_benidorm.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/1Wp6gc9/offroad_outlaws_money_hack_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xejulonejo/Qqifgc1/alto_s_adventure_free_download_mac.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/metal_gear_solid_5_phantom_pain_xbox_one_x_enhanced.pdfIn PDF document text
    • https://foxibujabav.weebly.com/uploads/1/3/4/5/134508678/3984499.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/7uNr1dJ/bitofo.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/SYij0XL/hero_xtreme_160r_price_in_chennai.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/T1heGI7/90896439715.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/fodorulu.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/4iaijGU/25795767467.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/Jhaogih/gabuxakixopepemedaretog.pdfIn PDF document text
    • https://cdn.sqhk.co/fapebenu/hjaxjcU/84929220192.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/a2bGhej/tubemine_app_for_pc.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/86671362309.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/dunkin_donuts_spider_donut_nutrition_facts.pdfIn PDF document text
    • https://fuwefojogimoro.weebly.com/uploads/1/3/4/3/134339806/5757a5bbf3.pdfIn PDF document text
    • https://cdn.sqhk.co/nubalevuvem/hb6She4/60292657716.pdfIn PDF document text
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/melafeb.pdfIn PDF document text
    • http://vumejopiraxu.mywebcommunity.org/58234005677.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/lowrance_elite_5_hdi_transducer_installation.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/ridNQja/loophole_movie_martin_sheen.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/fcjeXxA/nokasapotewusorax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maretubozewugi.myartsonline.com/casio_g-shock_military_color_ga-100cm-5a.pdfIn PDF document text
    • http://tosipasakuvil.myartsonline.com/25463487980.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/begarowofetofalakadureza.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_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 5248 bytes
SHA-256: b4e895471e417907971002488de3c0dd8f33e938d0801f40c23659d342539c8d
font_01_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 9912 bytes
SHA-256: e4d89010c3710534aa2a522d176fed576ce061a3ed5a57e6a4ff136b5d79a6ed