Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dc43f812fcd817…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 11:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 286d7ae9a2d2112f519b779c454621fe SHA-1: 5a7559282175ffe96cba6d767bf7a9e48c311162 SHA-256: 63dc43f812fcd817c0d2f2d60ca401bde85b106296d244d4947b48be857c5c5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the nature of the detected threat suggests it may leverage embedded JavaScript or other PDF-specific exploits to achieve its malicious objectives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synerhu.ru/uplcv?utm_term=best+apps+not+available+on+play+store PDF link annotation
    • https://asi-filter.pl/files/file/30745603355.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/47348609756.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327c16f1a8a---gunofurawibo.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210906_B0106C462590A017.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210907154855.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/mijolifo.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/25796550888.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/32999235621.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/futijejoxaki.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/98067794795.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/dopovirogux.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/vilikalenudamo.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/wigoxebiputanaxum.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/6586194472.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/56791963426.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/69659319641.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109052017493550.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/582670482.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d1e62d90442318af058651448c28f80b/75901521611.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/falilew.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/34286169781.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/83772643518.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/xumijekonogaguvijenu.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090816573673499.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_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 10620 bytes
SHA-256: cdc1b4817255977bbce7cff451be836c4dc10e573b05d51432c28b0a2870bab8
font_02_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 17724 bytes
SHA-256: 5c8feab3a40ec5952c4ce28f48029e1ad5c84b17de7252c03753f72ea8dc5a1a

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