Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbdb7eaf11f523f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 07:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3009e9e596f2d67f8cd192ca2493583f SHA-1: 9cf146f59bb837af5d295f94a11a842e44a5f01a SHA-256: adbdb7eaf11f523f639db0b948819cffef138e3abdd16d7d9762a712ada3b231
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The embedded JavaScript stream further supports the malicious classification, likely used to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=free+download+monopoly+board+game+apk+file+full+version PDF link annotation
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f96ff314f0---98181773372.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/sofapisilukiwidobixe.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/busasakabotomok.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/tuzeluvol.pdfIn PDF document text
    • http://bakoca.hu/files/file/gabosujoraluname.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/pugituk.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/vupup.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/39410270272.pdfIn PDF document text
    • http://neteyes.eu/editor_up/78466856011.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/89273149972.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/konapepi.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/diratu.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/foxesevesijomokanalelopuv.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/melupuzuxu.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/gavupavexefevuve.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/33633440741.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/bekilefebinukolux.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905081756426720.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/16293915053.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/tudixonezonikup.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/wisugofasetuka.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/0bc95olmkon6fsd8cb4b2a0p95/23523166595.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
stream_003_off0000be52.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBE52 11320 bytes
SHA-256: 5abeadda1f68ab4f388b1f8c231748db5a516a59a65b68ed30200ff76386c67b
font_01_sfnt_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 17028 bytes
SHA-256: 68d36100034ca79bfae8323a95d4d3e53da59eab9e0d1a0c6f70e57fd9ec190d
font_02_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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