Malicious PDF — malware analysis report

Static analysis result for SHA-256 71edaed961456a37…

MALICIOUS

PDF

69.4 KB Created: 2021-04-20 20:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 52b707baf209e00f827bd69ca1aa4c64 SHA-1: 573953ce7f7d9f7617f04a136408ab5a02f71069 SHA-256: 71edaed961456a3764ef37cb063599da53bea646866b1e541aec2e0627bdf14d
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=east+taylor+township PDF link annotation
    • https://cdn.sqhk.co/lobinazema/hekheha/tokividedisabobej.pdfIn PDF document text
    • https://mudobimug.weebly.com/uploads/1/3/4/8/134853100/936975.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/sukupipepoxudadapig.pdfIn PDF document text
    • https://zovafizi.weebly.com/uploads/1/3/0/8/130874114/zobefax_bezunezodov_vedakis_vurimufexixek.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/ha5QHhj/xaneluzubuwaxiwik.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxopejitin/mieSqja/15206997472.pdfIn PDF document text
    • http://bufezipuduxev.mywebcommunity.org/the_art_of_war_indonesia.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/gHPhiCH/pajeg.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/JHH1iic/lovitolipepabafidefuk.pdfIn PDF document text
    • https://cdn.sqhk.co/xawesani/hj1Yvie/18676360993.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/jbkjhDq/defender_90_vs_110.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/7jdhcDQ/13646215101.pdfIn PDF document text
    • http://mpvideo.org/fast_racing_league_dolphinn73s1.pdfIn PDF document text
    • http://vavexefane.mypressonline.com/algebra_2_review.pdfIn PDF document text
    • http://greyfruit.space/51633181173rpnnn.pdfIn PDF document text
    • http://tersq.fun/does_obamacare_actually_workzhmmg.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/hfqjbja/sutamufenepuw.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/ejjibie/jijakivilurujubawored.pdfIn PDF document text
    • http://m-laskin.ru/how_to_use_humminbird_fish_findersxm9x.pdfIn PDF document text
    • http://batmbatm.ru/32897137904h4y42.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/asp_net_mvc_3_tools_update_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefowolo.atwebpages.com/badunedexexobaxata.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/tovolutebidosaredos.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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 5060 bytes
SHA-256: d3ca4464c59cab755d38761e5087321bff59567067337ce383a846038507699f
font_01_sfnt_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 10220 bytes
SHA-256: 5d9297878817f6cbbde2e5abff71bba738253ae3943ac1f5349ee1d0e7e8a5b7

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