Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ce418f1f5b6667…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 05:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23823d6b8bf492f0cdb739cb7f5b514e SHA-1: c61231a74941021e98cf7729704ed3bc9c305854 SHA-256: a5ce418f1f5b66673fed618bd5f84ebdf13203c79496ef15ba15749c7cb8a8f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=intermediate+microeconomics+with+calculus+varian+pdf PDF link annotation
    • http://yokohama-model.com/userfiles/files/zawamofesedigebu.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/gajalugoxenatutisu.pdfIn PDF document text
    • http://sissonne.hu/editor_up/43141603487.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/jolafi.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210913080238.pdfIn PDF document text
    • http://hainfelderteich.at/zuzupive.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe7246a931---12873370309.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/17930552594.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/sigojevafizusugipiv.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/megix.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/sapawow.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/32411067341.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/soxeligejadasapow.pdfIn PDF document text
    • http://com123.vn/uploads/file/97743211701.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/93837033180.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/33508328638.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/zufixotudi.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/53995870572.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109032103203221.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/86808567563.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210916_235304.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/datexal.pdfIn PDF document text
    • https://olterus.net/contents/files/fedodimewaxate.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3134728087.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/sudikimomilifutumujo.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_off0000b64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64C 11088 bytes
SHA-256: c83a651606ce33300c2f57da79e24dff18e55c5376d968ce38c78a24394bb68d
font_01_sfnt_off0000d004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 15784 bytes
SHA-256: fb323067cf881c9a819b0b5653ba8ed3c2355e55b286756a88a2e07ad2c272d4

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