Malicious PDF — malware analysis report

Static analysis result for SHA-256 db81e197d1ec44bd…

MALICIOUS

PDF

73.9 KB Created: 2021-02-16 11:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a23b135b8e27c57802d5b74839d144b3 SHA-1: 62e6335479378faab238c34cb8f7f62673362ad9 SHA-256: db81e197d1ec44bd01f4ba5a9efd3a035e44af40eb9064ae261a4fd04ae5cc19
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, suggests a lure related to 'chemistry lab equipment worksheet'. The presence of multiple disposable hosting links and link farms indicates a likely attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=chemistry+lab+equipment+worksheet PDF link annotation
    • https://cdn.sqhk.co/kuruwoke/XcGgeig/live_wallpaper_samsung_galaxy_s8.pdfIn PDF document text
    • http://discount50it.pro/epigenetics_bruce_liptons8jqx.pdfIn PDF document text
    • http://redtea.space/50326307404qppta.pdfIn PDF document text
    • http://hellesypakk.online/pieta_signore_c_minor9j9yx.pdfIn PDF document text
    • https://tibefuwejar.weebly.com/uploads/1/3/4/3/134332688/5066811492b.pdfIn PDF document text
    • https://kilexudu.weebly.com/uploads/1/3/5/3/135347894/boxuboxupezetilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469852/normal_5fdf4b92e8947.pdfIn PDF document text
    • https://bewobuvepo.weebly.com/uploads/1/3/2/6/132695749/bivefokimil_konag_janeluxu_bumumofo.pdfIn PDF document text
    • http://myyshooop227.site/escape_room_answers_level_77wgv0e.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/1491165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_600f76c76074d.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/chjbmgA/3285869394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_602b2296e7198.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vosimalume/invitation_background_designs_psd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/91331793118.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/95772002800.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 5488 bytes
SHA-256: 18599e42275997a867e08fb77e1c3514ab96d8df8773a816cf1c7455c53715f6
font_01_sfnt_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 10300 bytes
SHA-256: d707deae898b9dfd45be92387699f913b58beb6424393a17071bb587199d66e3
font_02_sfnt_off00010c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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