Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b83c8bbb8e268a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 06:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87572243876f7e910607a77f179d0c2d SHA-1: fbe1cf983e09b8e0a097da7d3e2043e6391ca6e8 SHA-256: d5b83c8bbb8e268a9e232f70f6dd66e4e24fdf99bf5a5544ed140cb4146dcae8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=game+terbaik+iphone+2020
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/75293343476.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gukoxuxow.pdf
    • https://atputasbazes.lv/images/userfiles/files/92630701542.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/sofumixew.pdf
    • https://hoangmailogistics.com/asset/site/files/nowanevig.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/xagifa.pdf
    • http://apart1day.ru/file/veput.pdf
    • https://goldmenu.com/userfiles/file/novivasonibajekeset.pdf
    • http://saiprogetti.net/userfiles/files/32477634022.pdf
    • http://jamalcar.com/userfiles/file/13560269153.pdf
    • http://decaldankinh.net/upload/files/zugufon.pdf
    • http://pantryscan.com/123cars/imagefck/file/69420778138.pdf
    • http://asupuro.com/user_data/image/file/bigukojibekegivuberuw.pdf
    • http://moyamoya.center/images/hand_uploaded/files/gizitu.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135758b04573---21393331583.pdf
    • https://sproname.com/files/userfiles/files/parerotapar.pdf
    • http://nhatnamvina.vn/rich_editor/file/37162420693.pdf
    • http://footstepfloor.com/upfiles/files/11473514808.pdf
    • http://jwconsult2005.com/file_media/file_image/file/zugaro.pdf
    • http://twfindia.in/userfiles/files/48873542717.pdf
    • http://thegioicamdo.com/upload/files/19813079317.pdf
    • http://geoman.cz/data/file/20440496045.pdf
    • https://archielectronics.com/userfiles/files/70283840255.pdf
    • http://chickendaylacrescenta.com/uploads/files/27558597787.pdf
    • http://nature-revive.org/files/file/73579636738.pdf
    • http://www.monts.sk/upload_images/file/30757393571.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc97.bin
c9dfd94bd7bbb0e6475668229cbc3ebe2aa297e9fbccaf5dc7da39087ded3f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 10816 bytes
font_01_sfnt_off0000f521.bin
840265807b6420ad0f3d058f72bea2ddbab0bab735e4a3abef09c8ad44ed59c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 18136 bytes
font_02_sfnt_off000124e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 16792 bytes

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