Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5442ced7d52b4f…

MALICIOUS

PDF

85.0 KB Created: 2021-04-02 03:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 012f2f8483327f7907fc153c87adeb8c SHA-1: 7a28d30c133ba42229ccb870af5ef8cf4540c80b SHA-256: cd5442ced7d52b4fc68e623663862163685bf281cf42e591ceb2bf0712c06232
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample as a link farm on disposable hosting, further supporting a malicious purpose.

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://midufefew.ru/aws?utm_term=brand+identity+design+meaning PDF link annotation
    • https://cdn.sqhk.co/tupizurelir/hyIifkp/nasa_news_2020_29_april.pdfIn PDF document text
    • http://allieshouseofhope.com/skater_sasha_crossword_cluejngr8.pdfIn PDF document text
    • https://lajogaful.weebly.com/uploads/1/3/4/4/134481829/zewawaliduxima.pdfIn PDF document text
    • https://gezagijuxeson.weebly.com/uploads/1/3/1/8/131872295/kopenakivititonugib.pdfIn PDF document text
    • http://spindlndou.space/rogue_buddies_3_hacked_arcadeprehacksph47z.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/jChYkUc/neon_wallpaper_aesthetic.pdfIn PDF document text
    • http://tidivon.iblogger.org/is_fried_green_tomatoes_about_cannibalism.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/fagutosadimuliroxowarirel.pdfIn PDF document text
    • http://tranquils.space/gifefodofovuzq2pj.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/6644017.pdfIn PDF document text
    • https://rikomurisixub.weebly.com/uploads/1/3/1/4/131454733/jizuvu_donidasakijator_zaxujoleteku_lukuxosafubix.pdfIn PDF document text
    • https://nakotugobal.weebly.com/uploads/1/3/5/3/135300729/6003230.pdfIn PDF document text
    • https://cdn.sqhk.co/rujuwawuju/GhjNPxL/car_crash_videos_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/igJsjjh/rixejabetozokinep.pdfIn PDF document text
    • http://rituralajozeli.iblogger.org/calendario_dicembre_2020.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/workfront_training.pdfIn PDF document text
    • https://cdn.sqhk.co/vepefilome/TShbjg4/ortel_mobile_guthaben_abfragen.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/kalasinuwaxodigo.pdfIn PDF document text
    • https://jikonoligozeg.weebly.com/uploads/1/3/4/7/134755459/bawisozapud_domebowa_nomotinaf_wabonemavi.pdfIn PDF document text
    • https://lotefexikig.weebly.com/uploads/1/3/4/0/134097130/verogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xapupatefi.rf.gd/maravilloso_desastre_2_google_drive.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/bazupo.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/dosemuxifa.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/california_cooperage_hot_tub.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_off000110a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 5264 bytes
SHA-256: 1dcdf032b6399aa2f9f6a73de38b4af2e54323957975462ba3754e92e5198d5a
font_01_sfnt_off00012282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12282 10748 bytes
SHA-256: 7e852a2e62bd9cd78ec7389a84eead594d7b54bae4e963afc5a4faac21a5923e

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