Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f06df7fb0dba3c1…

MALICIOUS

PDF

73.1 KB Created: 2021-02-22 12:11:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c79d8ef30a48c73a32c0740ea4c7ffac SHA-1: b2b282e0352cd18b01dca414f91f6e2a8f5a4823 SHA-256: 4f06df7fb0dba3c1bc25710658a5f03a62a62021c4d9e51140e9e03778232bbd
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 and utilize UTM parameters, indicating a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to a journal, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=history+and+philosophy+of+life+sciences+journal PDF link annotation
    • http://parhelifrl.space/14690114622qbtgq.pdfIn PDF document text
    • http://twenty-promo2020.ru/givonoejmk4.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/Yqhgggc/cut_the_rope_2_game_download_for_pc.pdfIn PDF document text
    • http://ezfix.asia/one_ui_android_pie_split_screen5n8et.pdfIn PDF document text
    • http://berkeciftci.net/adventureland_iowa_hoursx8ps5.pdfIn PDF document text
    • http://jumpfs.space/34604042720mq22e.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/hhjjpg9/dream_hotel_club_new_york.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/21680841191irv0a.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/Y6wgdnq/forest_hdmi_cable.pdfIn PDF document text
    • https://cdn.sqhk.co/zixedagiro/dRjKhfP/world_cup_schedule_2019_soccer_live.pdfIn PDF document text
    • http://shmelev.pro/88432108972k5bi2.pdfIn PDF document text
    • http://craftsmansmetics.com/casualty_report_en_espaol2ki1e.pdfIn PDF document text
    • http://mailedflkf.site/13460317510t1s8f.pdfIn PDF document text
    • http://dithetsen.xyz/the_simpsons_tapped_out_hack_game_iosz7ydp.pdfIn PDF document text
    • http://dress-russia.ru/install_guide_wordpress_plugin_without_ftpqg0r6.pdfIn PDF document text
    • http://s7hmus.org/chloroform_solvent_nmr_peakd8cs9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaxutusurinav.epizy.com/72038559640.pdfIn PDF document text
    • http://dafevuzadolax.epizy.com/49073107544.pdfIn PDF document text
    • http://rifezovepon.rf.gd/letter_c_activity_worksheets.pdfIn PDF document text
    • http://dizutobasuxolom.epizy.com/kesolavajupu.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_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 5380 bytes
SHA-256: c135ff24892864f868658c4bcdf11a1da8d8dce9b5680966978d9598f8f43059
font_01_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 11372 bytes
SHA-256: 6b2e5837edf9ef5cc1350b6feac138e61524df28ccc278c5af33d6140110c759

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