Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32006ebe4e3a2fb…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 07:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77d9d38b888a9ddb94c748eea7fa17ba SHA-1: 4a17ac61cfdbdae1a7ab7b58ad4e23200bc30430 SHA-256: a32006ebe4e3a2fbb245f46f12bac3df29ce5643cbe5b5cc198afbcf129226cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and structured as a link farm, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://tplustech.com/images/ckeditor/files/24560662538.pdf In PDF document text
    • http://pcccphucvinh.com/upload/files/44511106330.pdfIn PDF document text
    • https://isosklo.cz/uploads/tiwobuwuzijomajubo.pdfIn PDF document text
    • https://thehouseproduction.net/file/wemorusebet.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/wewogalupojajuw.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/40023349397.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130c338368fb---56733043061.pdfIn PDF document text
    • https://tomas-music.com/contents/files/61035112399.pdfIn PDF document text
    • https://tckontrola.hr/files/18075824596.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/sajufejizadutowa.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/negupafetesagekog.pdfIn PDF document text
    • http://shahgrp.com/uploads/35600577957.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/57501815787.pdfIn PDF document text
    • https://ysh.my/userfiles/file/71571968103.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef56475a8c---68596815909.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/44513914863.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/37772149362.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/65727703602.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/59159173012.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/94316292678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vidmate+version+2015PDF 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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 17868 bytes
SHA-256: a4dfb41a8a53a5bb00de9daa6af0b621d38233ef41591f2a0ee8dbc5f4d31f42
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 10828 bytes
SHA-256: c728d6158bbac1ef7c4cbc1444732c69be195b6114209234faf3a56ac8d741fa

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