Malicious PDF — malware analysis report

Static analysis result for SHA-256 904ab86dcfa02209…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 06:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d3ef426aa5c2ee024103e39e857e330 SHA-1: cb638d435479f023bcae875af611affa80dada51 SHA-256: 904ab86dcfa02209efa79585627f190d1e32912ee3b69e76f26cabe3f4439882
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sdhouse.info/ckfinder/userfiles/files/poxaforituriro.pdf In PDF document text
    • http://sanga.asia/userData/board/file/18362439639.pdfIn PDF document text
    • http://villkasz.hu/editor_up/45171663694.pdfIn PDF document text
    • http://prota.ru/upload/files/40946409149.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/55999528750.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a19884b961---vivegak.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/xurotejavigefofipimeru.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/napukemesu.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/gugukipimafuwedejovedo.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/dudulazituzanidalugazu.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/rafofumi.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/zojifekimu.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/64587500627.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/21176273680.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/26026348803.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca6092f2b---gufexeseputozegilowase.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/rulasunuxotomati.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/86547256909.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/83790213122.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/94593900669.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/89376904772.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/94039363416.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/vilinusidipofu.pdfIn PDF document text
    • http://sdes.in/uploads/82368555422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mjunoon+tv+download+for+pcPDF link annotation
    • 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_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 10596 bytes
SHA-256: 195e12dd665bd2d56ebaa7f27715fd9fdd2627c4a96f67685db65e843a113a57
font_02_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 18232 bytes
SHA-256: fa088b87d5b29ac1d80f5328ba4bb8274404eee6340180c6939fb9fdcff0564e

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