Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3b71a4e276a685…

MALICIOUS

PDF

79.5 KB Created: 2021-04-30 02:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2217c96ee41bfe7b93d1cf7fcadde0a7 SHA-1: 32b45bef699cb7bce5b87f10d9e4ced47259f7be SHA-256: 3b3b71a4e276a685240e10492d6941dbcaa71a6ea9253befb6425ac2f849690e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to press Win+R or paste a command into a terminal, a common social engineering tactic to bypass security measures. The presence of multiple external URIs, including one pointing to 'fokemale.ru', suggests the document is part of a phishing or malware distribution scheme. No scripts were extracted, but the overall pattern points to a phishing lure designed to execute a command.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://fokemale.ru/strik?utm_term=how+to+open+paint+through+run+command PDF link annotation
    • https://cdn.sqhk.co/vuxeneson/jdjaEif/59271252951.pdfIn PDF document text
    • http://idslim-italia.site/shadowrun_5e_chummeru1aq4.pdfIn PDF document text
    • http://mediaverifiedbadge.com/hp_laserjet_pro_400_m451dn_duplex_color_laser_printeroxdjp.pdfIn PDF document text
    • http://bluebadge-support.com/27520512685sl6f9.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/qniehb1/guide_tennies_five_ten.pdfIn PDF document text
    • http://vofufime.mypressonline.com/how_to_draw_a_constellation.pdfIn PDF document text
    • http://good-production17.site/facebook_messenger_appdbvyr.pdfIn PDF document text
    • http://girlsbeach.space/creature_full_movie_300mb1rfcd.pdfIn PDF document text
    • http://verifiedbadges-form.com/50812892878bn2xk.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/anxiety_workbook_cbt.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/iftRhjY/53958151209.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/catan_dice_game_rules.pdfIn PDF document text
    • http://sozimaxetupow.mywebcommunity.org/catia_documentation.pdfIn PDF document text
    • http://load-bcp.com/barish_song_yaariyan_moviestjx1.pdfIn PDF document text
    • http://novofikupeneda.mywebcommunity.org/bunavobenenexub.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/practical_english_usage_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jekurur.atwebpages.com/42043608369.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/adarsha_hindu_hotel_book.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_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 5328 bytes
SHA-256: 5422b20860dc7d046841023da8f7d263817df76c4f110bc68c41d61919fd2562
font_01_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 11316 bytes
SHA-256: c38ed2015a3c1da7cd773c7ff898d732a834ec6dcf85c109d2576d4a84775da8

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