Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6d8e74fc676440…

MALICIOUS

PDF

89.2 KB Created: 2021-03-31 10:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 74d0a39291082f2a1bd36a80264233de SHA-1: 46ab5a3c4ac2acd07d1e5c1b4a94f4c3dcab94e9 SHA-256: 4f6d8e74fc676440ed49f0a7f164ad8db9b6c13eb88bef6e734bf8d945b24eec
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. It contains numerous external URIs pointing to various domains, suggesting it functions as a link farm or redirector to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/award?keyword=assemble+and+disassembly+of+system+unit+pdf PDF link annotation
    • https://cdn.sqhk.co/xolofiwano/jroDegj/swing_shift_jobs_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/jibgcjg/76052385642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421767/normal_5fe9000960ac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470228/normal_6063f81992964.pdfIn PDF document text
    • https://cdn.sqhk.co/nidimaru/X7gcphc/17699763627.pdfIn PDF document text
    • http://talakam.space/leche_entera_alqueria_informacion_nutricional4h1bd.pdfIn PDF document text
    • http://world-wildshop.com/94671524100nv1sc.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/tamudowabowiwamujo6njav.pdfIn PDF document text
    • http://donbetosstreettacos.com/solving_simple_linear_equations_worksheetooyb2.pdfIn PDF document text
    • https://cdn.sqhk.co/jilowepe/Wgmjjc6/73718453606.pdfIn PDF document text
    • http://cybety.xyz/baby_trend_pack_and_play_replacement_matozwj0.pdfIn PDF document text
    • http://gakmancreatures.ru/feist_1234_video_hdmz1wi.pdfIn PDF document text
    • http://big-ita.space/the_white_tiger_film_plot_summary6sz0v.pdfIn PDF document text
    • http://help-business-media.com/microsoft_access_database_tutorialhth50.pdfIn PDF document text
    • http://testertumentum.space/area_of_irregular_polygon_worksheet6779e.pdfIn PDF document text
    • http://atomyimperial.ru/35976380994junmp.pdfIn PDF document text
    • http://study-english-04.space/4494418137790u3h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_60393b21b126c.pdfIn PDF document text
    • http://logoped-samara.ru/mixer_yamaha_mg_166_cx_manuale_italiano7almq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415530/normal_601a9d3ea0daa.pdfIn PDF document text
    • http://axecheat9.xyz/analytical_skills_behavioral_interview_questions_and_answerstc0t7.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/wewiro/13688068439.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/atikmdag._sys_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/bosch_super_silence_plus_42_dba_no_power.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_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 5320 bytes
SHA-256: 8693598894e3378ca5093b309dc0c80d503cbb917a0a22808fdb460b5538195d
font_01_sfnt_off00013227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 10844 bytes
SHA-256: db6a078c0393809a14b15cfedee4c0d50c8e2943e3f6ab118ced517c536271f8

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