Malicious PDF — malware analysis report

Static analysis result for SHA-256 901b1bd62c8b7b51…

MALICIOUS

PDF

102.7 KB Created: 2021-03-13 17:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0017f7c4160945377a42b30410af055b SHA-1: f40d563cbfaa5b496c08e2a9d4418f3867409e84 SHA-256: 901b1bd62c8b7b519fb7c2f74d85eb174827aa55ea7ef9525cd875a2b6eda8ec
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the extensive use of obfuscated URLs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=what+does+the+term+tee+off+mean+in+a+car PDF link annotation
    • http://bigpleasure.ru/hp_stream_laptop_says_plugged_in_not_charging5cgow.pdfIn PDF document text
    • https://cdn.sqhk.co/wixakulu/frKbjig/garden_luscious_strawberry_themes.pdfIn PDF document text
    • http://opensoda.pro/doxagafqsw4r.pdfIn PDF document text
    • http://gtomishebs.xyz/jolaguxoturenug8lb0w.pdfIn PDF document text
    • http://citruss.space/sunikeduzarcowbc.pdfIn PDF document text
    • http://dreabling.online/9844139345wkcgq.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/parts_of_speech_jeopardy_game_online.pdfIn PDF document text
    • http://botefin.medianewsonline.com/vedoren.pdfIn PDF document text
    • http://demask.space/874447161095cnwe.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/how_much_is_wifi_on_allegiant.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/GjjSdgf/guess_movie_name_by_emoji_with_answers.pdfIn PDF document text
    • http://storeplus.info/l_histoire_du_cambodge4hh8q.pdfIn PDF document text
    • http://itnegozio.info/maus_volume_2_chapter_1jvo4q.pdfIn PDF document text
    • http://albatros-trans.ru/96950330288jcyap.pdfIn PDF document text
    • http://playmarket-online.com/how_to_rebuild_briggs_and_stratton_enginej6l78.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/0ggjjgi/40911959618.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/the_castle_kafka_analysis.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/the_gift_lewis_hyde_goodreads.pdfIn PDF document text
    • http://fridgeservice.ru/can_i_use_my_roku_stick_without_the_remotehi29l.pdfIn PDF document text
    • http://haifaiv.ru/finding_area_of_odd_shapes_worksheetsubcr6.pdfIn PDF document text
    • http://xviiivbgz.com/dalukakunolotugpjp0q.pdfIn PDF document text
    • http://detonic-italy.website/81687431992u2pyg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001509a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509A 5244 bytes
SHA-256: 68aed6980d15b9fce91cdaea9ec9ad5c7518d1334b068c823ccf00361d978fb8
font_01_sfnt_off00016251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16251 12024 bytes
SHA-256: c5415dd44199df384c4fce9755c3283d411b003451a5519bc1d1e773dc6db774

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