Malicious PDF — malware analysis report

Static analysis result for SHA-256 d868a02af77174b9…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 22:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a61c33a8aaee93982f83d6609de6627 SHA-1: 072e031ee7bda32b8f2639f99904351e753c1887 SHA-256: d868a02af77174b99e4d412e52bec4505573c873a9c68e49a04a8b1aaa4adf7f
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, with heuristics indicating it functions as a link farm on disposable hosting. Multiple embedded URLs point to external PDF files, suggesting a multi-stage attack or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a pattern of hosting numerous small PDFs on distinct, potentially disposable domains, which is common for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/sisajube.pdf In PDF document text
    • http://robvancampen.nl/userfiles/file/5273990773.pdfIn PDF document text
    • http://gewald.ru/content/Files/69093792222.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/82142680458.pdfIn PDF document text
    • http://pi-consulting.ch/download/88497412189.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/14528276928.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202191325727170.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/bolokikekigumovoj.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/difajidigokip.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210910_B423A51C5DB8F3CF.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/xosorunipelugum.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-1/20210901232954362929.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/89921280521.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/giwisosijawesumuvo.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109041746164450.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/20132366656.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/7867528026.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0bfe4a51---78174889561.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/10275448589.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/657346345.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/vinesosofapebod.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/nodapasagatewanuxaramiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=starts+with+p+ends+with+yPDF 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_off0000b30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30C 10596 bytes
SHA-256: e99c16a4c3730aac460bc62d540156fca72224216158ea015495c83563fdf904
font_01_sfnt_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 16928 bytes
SHA-256: 7f0b9efa79445c737c3760724c022c6f07d828a5c7f6b3e19df68817b9e6a43c

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