Malicious PDF — malware analysis report

Static analysis result for SHA-256 7920eb789aac2570…

MALICIOUS

PDF

81.8 KB Created: 2021-03-19 18:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a65498f610e06a9e4b646d9a87c7ea04 SHA-1: b9925a0c1fe907a60ed1ecced8f10a33b2931d80 SHA-256: 7920eb789aac2570826e7dbf4279b020e1cebb03ff336d0aca556261ed573616
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://vilenefex.ru/strik?utm_term=introduction+to+accounting+textbook+pdf PDF link annotation
    • http://gopusoduj.mygamesonline.org/ntn_roller_bearing_catalogue.pdfIn PDF document text
    • http://leqqurint.online/gaddafi_green_book_english4hnaf.pdfIn PDF document text
    • http://vvd.bar/gary_moore_the_loner_live_in_stockholm_1987mrcg0.pdfIn PDF document text
    • http://yoptan.space/jiwabavoxidotegcctp.pdfIn PDF document text
    • http://stal-kemerovo.ru/rush_limbaugh_radio_stations_californiagrz4k.pdfIn PDF document text
    • http://soldonlittleton.com/why_is_apple_tv_remote_app_not_working5bs3g.pdfIn PDF document text
    • http://info-pages.ru/colorbond_fencing_sheets_perth1bkle.pdfIn PDF document text
    • http://gtomishebs.xyz/9469221970141tmz.pdfIn PDF document text
    • http://idealicaufficiale.website/7_principles_of_making_marriage_workxd1jh.pdfIn PDF document text
    • http://899themes-demo.ru/kenmore_washer_model_110_bearing_replacementdo1xx.pdfIn PDF document text
    • http://bizbize-yeteriz.org/58108238328u063l.pdfIn PDF document text
    • http://pshcomonhere.xyz/how_to_clean_filter_on_dyson_dc25w2t9u.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/calendario_serie_a_19_20.pdfIn PDF document text
    • http://cleaner-inn.club/tiworitosamipejunezun17jv5.pdfIn PDF document text
    • http://mmmmmme.space/sense_flip_clock_weather_pro6ciwt.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/98428465590.pdfIn PDF document text
    • http://floradoma.net/dr_babasaheb_ambedkar_jayanti_photolwrcv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_7a1b0485ec8e439a8e8285deb1322e41.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_6a8aaceccbfa4bc794c5b92bd9065bd5.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_dc3f4d5187f04893973e82a5fe98425d.pdf?index=trueIn 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_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 5324 bytes
SHA-256: e7e4bb3d3e615002546aac337409da85304d950181f603f6ac3a8e84a2aa058c
font_01_sfnt_off000112da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 11516 bytes
SHA-256: c660fbca7e6eea8320140e00aa0777b8ee848900ad42571567e5c8fcb5bce0ea

Open this report in the interactive analyzer, or submit your own file for analysis.