Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03e19b63fed362c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 06:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 952ec5e0cb73554ddb61ec75a0c61604 SHA-1: 990f30275020da87ad149df85241d93255325eb5 SHA-256: a03e19b63fed362ce6726edbfb9ecc92e61e4ff15a1bd0d8cf7ff425c2f41a33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains a link farm with numerous links pointing to various domains, many of which are likely disposable, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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 http://millecolori.it/images/file/25010645981.pdf In PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210913083048.pdfIn PDF document text
    • https://interconformity.ro/images/file/wagiwebaxonule.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/69510044530.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/60284455184.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/bumuvadu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ktq9fu5l0gsrn8od7lvj16hf18/16441567137.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/95476959673.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/pexipilurel.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161407a71503b3---fejikenegalofare.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/18779354819.pdfIn PDF document text
    • http://ahchala.com/img/file/wevisijaduxatexodatak.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/19065281314.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/66451649724.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/47420342256.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/lepuwu.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/ruwirelukuzajawej.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210906030445_7uinme.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/tuvipeloxawuwisoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ufo+vpn+premium+apk+download+latest+versionPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/63979077559.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_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 11012 bytes
SHA-256: 4d54bc0464fe9b09e56de4d83eefe55b4979e0a943c894538187bfb51e2c2841
font_01_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 16848 bytes
SHA-256: 7417fe5c77ef71f164ab80c05843f3e8f5367667bfd716aa2ab6b5139b0e3ab2
font_02_sfnt_off00011855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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