Malicious PDF — malware analysis report

Static analysis result for SHA-256 19df1afa99ed26d6…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 05:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 234c6a96cacb992a0105026cb7fa9d1f SHA-1: b71e0a863c80add21594a2b9662cea2812a8e3ca SHA-256: 19df1afa99ed26d6640f34115d9ddf253d28d35f186b19fbb37340f9df80ef6a
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm directing users to numerous external URLs. The PDF's structure and embedded URIs suggest it is part of a phishing or malware distribution campaign, likely leveraging spearphishing attachments as the initial access vector. No scripts were extracted, but the presence of external links implies a redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=pdf+creator+for+android+phone PDF link annotation
    • http://thaifilmind.com/UserFiles/file/80176340440.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/pogijegojusowa.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/pifimopa.pdfIn PDF document text
    • http://beiks.info/public/file/31542080413.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/91808934125.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/54736344208.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109031743473535.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/xesopubusiwo.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e878b9050e3be5031d23b54374d5fe7f/37929728139.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/66690218057.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/23609359635.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/38055055317.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/46047923151.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/8936723943.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/tekuvelutujefezo.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/32413133404.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/kuruvibi.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/liwamugud.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/50796347275.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2109d055ca15704011eca8181af1b27c/69633677401.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/50141811949.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/95678849115.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/gegaxa.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/banubexexinuvol.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_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 10504 bytes
SHA-256: 20ffd4f1bee3c00a64f6be163b4bf9eca45f4a6af4ce27a8bbc6adba3ffa2b88
font_02_sfnt_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 17768 bytes
SHA-256: bad79eb6da7ddc2b081c54580de762c57b7244e3b887ddfc25e7bc3b26795a56