Malicious PDF — malware analysis report

Static analysis result for SHA-256 335bb5a465a4f251…

MALICIOUS

PDF

79.0 KB Created: 2021-04-04 19:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bb99399ba1e20e15a524d8502dbbe4a5 SHA-1: d716c328f3c720fcd13a7c707da257145c29344b SHA-256: 335bb5a465a4f251c792afae54df6ea9515476b47cb341e9e265053488221b73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ponafet.ru/strik?utm_term=comparison+between+classical+and+modern+management+theories PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447880/normal_60344a3914d71.pdfIn PDF document text
    • http://pihodze.com/sse_fixes_or_sse_engine_fixesnoymv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_603cfab97cd5f.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/onan_microquiet_4000yjsze.pdfIn PDF document text
    • http://ylyn.ru/21715196866c0j1c.pdfIn PDF document text
    • http://pubggaming.online/guidebook_publishing_reviews16qlg.pdfIn PDF document text
    • https://movefaka.weebly.com/uploads/1/3/5/3/135304133/5325828.pdfIn PDF document text
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/2404608.pdfIn PDF document text
    • http://dontbeshy.xyz/2015_ncaa_division_2_football_stats077th.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_5fd9a928e3d86.pdfIn PDF document text
    • https://cdn.sqhk.co/medasozuf/gfZUFH0/mijeta.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/ig20qib/tolagukokizo.pdfIn PDF document text
    • https://koborabi.weebly.com/uploads/1/3/0/7/130775888/daniti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fcbc6b4f11e3.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/hjLFq3c/beck_hyperspace_2020_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/bikawegaj/gcjegjd/geometry_dash_meltdown_free_online_pc_version.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/7gi2L74/lixizopokajefapatulewuz.pdfIn PDF document text
    • http://true-board1.club/28560245826b2r9g.pdfIn PDF document text
    • http://study-english-02.space/47994413059jtuv4.pdfIn PDF document text
    • http://podarokinsta.online/todays_national_news_headlines_in_english_times_of_indiai2sow.pdfIn PDF document text
    • https://jazitilifa.weebly.com/uploads/1/3/1/4/131414561/gumuna.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/5d4f050ff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_605d8db57652b.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/tifuwuw/ascites_approach.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/call_recorder_acr_premium_apk_full.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/76149909354.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/save_game_assassin_s_creed_rogue_ps3.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_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 5624 bytes
SHA-256: a03ec8cc14b35cacc721f7bcff1671f711a8f120d4945f6804c2b965baa835a8
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 10540 bytes
SHA-256: 429bb47ae31e1299c9a2703ad9d405d545eaf1d0a4b9e3fbb07090614556e89b