Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbb870008072916…

MALICIOUS

PDF

67.2 KB Created: 2021-09-26 08:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 831182e0d28e3e2470415f1dc6ec78ab SHA-1: 58d1f3db83745f62f5e33e5b6d150671d0e95a78 SHA-256: bcbb870008072916033b6d91c45b4223e18c9cf12795f3a5e78412113476e1d9
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=watch+directv+android PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b1lbme32p5upqtbuvrsk27eqa6/28540393166.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/diwokizujirupobe.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/63378832734.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/zasat.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/vuzupilofumilebirunewefa.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/bepeware.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/zasuzisodipuwekog.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/bexugovufagevejawupizo.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210920_360148E9BD510A1B.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zobolot.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/sokerikibir.pdfIn PDF document text
    • https://dafelia.com/files/29572640035.pdfIn PDF document text
    • http://sswjeans.com/files/11105390179.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/18306102283.pdfIn PDF document text
    • http://guchen.ru/d/files/pidabosavulesepusize.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/97810683581.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_off0000a776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA776 10312 bytes
SHA-256: 6c6b126f5b7b5d1c112fca722512bc4d17ca0b0b422849fa1d56303200d40317
font_01_sfnt_off0000beaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAF 16288 bytes
SHA-256: df28f8ea67f1b6d2e6d68c001a68c754213444c1b15000aba07df65644462f61
font_02_sfnt_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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