Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f3363cdeb9a8e8…

MALICIOUS

PDF

89.6 KB Created: 2021-04-14 11:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 830369f9debf68e497144a83e2de20a8 SHA-1: d538b7798d2b12e6820843ae72962ddb2eb834cf SHA-256: a2f3363cdeb9a8e8ad481392bbf555b9e3eee29ecd82bc6923719e19dd1d6137
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many with numeric or generic slugs, indicative of a link farm designed to attract traffic or distribute malicious content. The primary URL, 'https://xezojetit.ru/strik?utm_term=where+to+watch+sarah+plain+and+tall+movie', suggests a lure to a site that may host phishing content or further malware. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=where+to+watch+sarah+plain+and+tall+movie
    • https://cdn.sqhk.co/litanamamusi/n7hfhaB/rowuvojesutovus.pdf
    • https://cdn.sqhk.co/liwifetil/gdjjhj1/fipotetuta.pdf
    • https://cdn.sqhk.co/zidodovare/ePjbDjd/bedwars_map_minecraft_education_edition.pdf
    • https://cdn.sqhk.co/kigezarokoji/ifgQfdP/5974264303.pdf
    • http://hotsales-com.xyz/optiplex_gx620_audio_drivers_for_windows_7spi3p.pdf
    • http://websporizlehd.com/this_is_gospel_piano_sheet_with_lyricsviybq.pdf
    • http://blekrossi.ru/gapumojibifakenurubujugw03v6.pdf
    • https://cdn.sqhk.co/kuzaxepigi/ichjvha/43596483453.pdf
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdf
    • https://cdn.sqhk.co/lixozimiz/ihehdip/search_everything_software_for_pc_free.pdf
    • https://cdn.sqhk.co/vulovosovem/iijVidk/canon_imagerunner_2204n_scanner_driver.pdf
    • https://banodita.weebly.com/uploads/1/3/4/3/134311275/sipika.pdf
    • https://zanewodibamejat.weebly.com/uploads/1/3/0/9/130969445/gavapawevuvedose.pdf
    • https://rasazumeg.weebly.com/uploads/1/3/1/4/131454762/318dbcffa9.pdf
    • http://vkysnaya-eda.site/libro_de_instrumentacion_industrial_creusdcule.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bd1812aa-71db-47d2-9f9c-0babe7d9688a/niguxokawolesi.pdf
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_b1f9699fbf6b4146b5bd5aa3dc09822f.pdf?index=true
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_bdf2251eff5f426caab784391395c029.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ce07d8e8-cde6-4b52-81d2-d8af0e4d5e1a/geforce_570_vs_970.pdf
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_69e37ab331d047afa47ea79cf9438329.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cd1cf4ab-cf38-409e-808c-ecc9633b4c8a/lidarewumur.pdf
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_7744f5ccd6fe42af9cd3a703575d8e55.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011022.bin
4da6ab613a1878984a79d3473a22532a5ed4b38634564c48f42a304da7f89261		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 5264 bytes
font_01_sfnt_off000121eb.bin
c0d3b7e3b0e08457118333bcd97fe028f7d7ee77ebbb02e24d438bbb1a7034f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 11576 bytes
font_02_sfnt_off00014900.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14900 4324 bytes

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