Malicious PDF — malware analysis report

Static analysis result for SHA-256 7638cd653f7c90c8…

MALICIOUS

PDF

85.2 KB Created: 2021-03-06 10:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 47c6fce83f6e50d8feeb14f085597201 SHA-1: 7cb4d09e54e6f665deec021a63d0625bd9b639bb SHA-256: 7638cd653f7c90c8825713f8572b019995c7a576f9aa4043301bf322e239de43
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, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dugedepap.ru/strik?utm_term=a+simple+favor+trailer+reviews PDF link annotation
    • http://trickyturkey.com/britax_marathon_clicktight_nz_revieweftwa.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/4jduhfg/luwisesazipewunekidip.pdfIn PDF document text
    • http://kinokaiff.space/crochet_penis_scarfmur2x.pdfIn PDF document text
    • http://krokoboko6.xyz/bissell_powerforce_powerbrush_brush_not_spinningoc1iu.pdfIn PDF document text
    • http://richteam.site/reading_comprehension_passagesvx24t.pdfIn PDF document text
    • http://dreamingdeveloper.com/refadagobinobakifabevil5hdgz.pdfIn PDF document text
    • http://remontlegko.info/reducing_large_fractions_worksheetrnehx.pdfIn PDF document text
    • http://oneshops.space/manual_hoyer_lift_instructionshwc5n.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/sunbeam_heated_blanket_f2_error.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/best_bodyweight_exercises_to_lose_weight.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/jacj1aK/border_crossing_restrictions.pdfIn PDF document text
    • http://zumbayuliya.online/dell_studio_1737_cpu_support4u29l.pdfIn PDF document text
    • http://ooovseanalizi.ru/handwriting_worksheets_cursive_letters981ti.pdfIn PDF document text
    • http://lngcliente.com/nusufozamaramagedqs202.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/gdEgegi/survival_on_raft_online_war.pdfIn PDF document text
    • http://sks-expertiza.ru/02_jetta_2.0_transmission_fluid_check7pu9k.pdfIn PDF document text
    • http://flipping-car.online/casio_g_shock_battery_replacement_philippinesk8fjc.pdfIn PDF document text
    • https://cdn.sqhk.co/solumapidema/T6heZhg/acrylic_nails_coffin_shape_designs.pdfIn PDF document text
    • http://healthit.space/bizhub_c220_parts_manualno757.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/82265356435.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/vinegaroon_care_sheet.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/88461657307.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/free_fire_game_jio_apps.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012a7a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A7A 18336 bytes
SHA-256: c7d973eb8a9ffe95afcd8517008e01c3c80244a7081f34c8128eecec0cfa7811
font_00_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 5188 bytes
SHA-256: b8180b62f5761c7246c328b8a9d14963e65b2918ccb26b0ff3e4ba2d58b79b18
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 11388 bytes
SHA-256: 27642d39c11c0499a04319634f239aaa8a223553a8fdbfffa06f9727a7d37b47

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