Malicious PDF — malware analysis report

Static analysis result for SHA-256 deafec06fd598b51…

MALICIOUS

PDF

73.3 KB Created: 2021-09-20 05:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6e240a7c500b2185fd5edc89f025b03 SHA-1: 53a4053234e7371c47c2b103634d064c39bd7ad2 SHA-256: deafec06fd598b51596c4f7e31298d6ffad2b7635d632f372427d71374664069
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URLs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=what+is+ant+radio+service+on+android PDF link annotation
    • http://yingtailong.com/upload/file/210920092303628723wwfdr8n6kgnp.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/gejuwidivavedededenev.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/39053261769.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/63211898019.pdfIn PDF document text
    • https://makenie.com/upload/files/1585376164.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/fesaloxokonudaroxaf.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/lunozilozaj.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/14264547624.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/11654927429.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ce9a151d4ce70967dbbd8b3c1790faf0/lomemodebigabeladubegofa.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/jonuzetikupi.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mikuxijujesirefojovifo.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/pamiweg.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/najonigimeli.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/fufedejavixiji.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/povojajipu.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/86376371289.pdfIn PDF document text
    • http://llux.vn/uploads/files/kijajagolimiwidoresas.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/kawilakavevakosadakewaxak.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/kikej.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/xafaniguvumidivij.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/17857830619.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/43243111990.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/pijamakolulijuvevawebafe.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/lekebem.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 17156 bytes
SHA-256: 5e0be61bb749591501b12c3929045a6eb83deb5ddd8058d56da15f1dd1400047
font_02_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 10480 bytes
SHA-256: 5e2b42b4c00243d4f380252f5b252b11957c78bc0b79c99f747d0f25390bed49