Malicious PDF — malware analysis report

Static analysis result for SHA-256 03405036b837de68…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 19:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef016867eeae0757e71434ce92aa29e7 SHA-1: 1bfb46d9261ec86e74cd6e92edf9d3e5269123cc SHA-256: 03405036b837de688e23aaa04acd5300046315f3a437c45b6ad6f4b8edc08eb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The document body is unreadable, but the presence of many external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kondicionery-dzerzhinskij.ru/upload_picture/file/19815834129.pdf In PDF document text
    • http://bigcool.net/webroot/img/files/filipufimuf.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/nuberur.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/57840694186.pdfIn PDF document text
    • https://cooperspick.com/files/49531752440.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210906_6276F9D88CDE9C01.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0cde09f6755a1dc49a6ac0244ff9831b/62676986127.pdfIn PDF document text
    • http://carszana.com/image/upload/File/35532210348.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/39968746777.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/98888607802.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/gewuzijevufelomu.pdfIn PDF document text
    • http://cssh.es/img/file/86696516871.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/lezilubunarodimepomajilil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=magic+crystal+ml+hackPDF 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_off0000c76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76D 18568 bytes
SHA-256: 63e36142677eba5e8b29d571e0ddf07bbafa1ed7b64c69c860c7d3979625d3f3
font_01_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 10520 bytes
SHA-256: c218551ae6cb0ea5dd0fa61ab6ce4360e47124ddb01044850ac7e86715b99ff1

Open this report in the interactive analyzer, or submit your own file for analysis.