Malicious PDF — malware analysis report

Static analysis result for SHA-256 02e3c7a6d41cef9c…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 10:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a35193aa21cd59c07b6ff71431f0bf7d SHA-1: f36b1e253f160029b03ca628299bf474052aa0f3 SHA-256: 02e3c7a6d41cef9cd2bb40e303257de49127e74d473ba1153690ddb6d9bf0ee1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious sites. The PDF structure and the presence of external URIs suggest an attempt to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=words+that+start+with+w+that+mean+good PDF link annotation
    • http://eshop-kocicinadeje.cz/files/file/fezirusiteretibidugulebom.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/bdd07cc3438adbad1418a5e32953c9ce/vupuxefejexa.pdfIn PDF document text
    • https://viceda.com/userfiles/file/20991977336.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/kurusejivexolegeto.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210913221124.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/zapifebu.pdfIn PDF document text
    • https://vpmemorial.net/images/file/rofuzagupolubewiwa.pdfIn PDF document text
    • http://vanhacollection.com/images/files/furipekusu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/8749916746.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/dojidazofuleva.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/39490222413.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/zepubezutasumozarewisokuv.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/90362029092.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210913060225.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/59828564807.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/60245117061.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78552379158.pdfIn PDF document text
    • https://binhvi.com/upload/files/xiziwasuzajusu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613690cf6c30d---93809816605.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/pagizulatakiwofetoli.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/71725257458.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-10/20210910090715569342.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_off0000bb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4C 17088 bytes
SHA-256: 79e37ac878d1e213b66ce43df361292360c36750c33c6fcc96539011f154af60
font_01_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 10728 bytes
SHA-256: fae9175cb99568063263f3bd67bb383b6db03f39d4a1af11c5a6f4142acd4a3a

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