Malicious PDF — malware analysis report

Static analysis result for SHA-256 55892ff791cecbc5…

MALICIOUS

PDF

83.3 KB Created: 2021-03-22 23:18:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c00610dacfbe95772d2db321301fb6fc SHA-1: 350a565ca155f167f920740ed810e6932c1eb0a7 SHA-256: 55892ff791cecbc5c4c2827b6ac609c310b75a0297a8df45db5b022ac2087fca
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, indicating a link farm designed to redirect users. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=how+to+animate+on+ipad+photoshop+cc+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457000/normal_6013aa4f95925.pdfIn PDF document text
    • http://003-center.ru/91315227369rtihq.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/aic9heQ/barbie_fashion_closet_mod_apk_android_1.pdfIn PDF document text
    • http://folubowavu.22web.org/vefedalikaneliravis.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/gJYjhjc/my_boo_virtual_pet_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/ggiWZ6U/world_history_for_us_all_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/hbgjGj7/tepowotufokigejumuvapa.pdfIn PDF document text
    • http://detonic-de.website/jinawaxazatamc5876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_600fe9340b455.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/jav8jiv/41603145545.pdfIn PDF document text
    • http://vir-tus.com/kathy_rain_ios_walkthrough5nzcx.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8AmrwRe/word_crush_level_764.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/hjfhbhj/tiktok_star_died_from_corona.pdfIn PDF document text
    • https://cdn.sqhk.co/repoxovu/1bqqaic/46993246345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5fd8628daf872.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/df202a6c-fcd5-40ca-b803-144341d6d602/38598141530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd212b1-a916-44d6-a5e7-2c01bc9ad3ac/what_episode_does_carry_on_my_wayward_son_play_in_supernatural.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd39bfa-69b3-428a-b442-a021c1d5b204/18885448851.pdfIn PDF document text
    • http://dopodisimedu.epizy.com/tebavotejuvavuzedotuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3272d51-2291-4554-82ad-ca3c57b85447/91044592927.pdfIn PDF document text
    • http://tekisinasapev.epizy.com/vidas_secas_filme_completo_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0921edb-21a8-4f4e-8943-dc40c9aefd47/navy_fitrep_opening_and_closing_statements.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_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 5720 bytes
SHA-256: dc661e7c3915896a8c970a861ad41d81cd89544396843948ed4b3b5e6c43c606
font_01_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 10740 bytes
SHA-256: 6476007354d4ea05d7e135879ff4062fb2f5c462fad892bdb7c938a97254e16c

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