Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52858fcc8091494…

MALICIOUS

PDF

67.4 KB Created: 2021-09-12 22:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efc05ef2c276a0f46d4f3bf039fda9ca SHA-1: 8021714476a4e92723374ae6f88d3f09d7c76bd1 SHA-256: e52858fcc809149412b8578613d3d28e96422d03f7625ad6baca6222dda6ee0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 PDF files on various domains, suggests a link farm designed to distribute malware or facilitate phishing. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the nature of these links, aiming to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://nstoplana.rs/ckfinder/userfiles/files/sanopukuxaruzemita.pdf In PDF document text
    • https://cambodiadriverservice.com/userfiles/file/nedanobalumoguberul.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/96161681936.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/tawitalefafubisoti.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/garinafaxofezuganubijata.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/68582618229.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/52918361394.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202108312235232567.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/kozive.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/dotokopifaxafabisawexelef.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/xonovusezijujexefemedef.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/30833433578.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/18690403459.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/69609606099.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138c9850fc28---vizivuxukusi.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/43929924249.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/26017270555.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/92956198330.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109090816378512.pdfIn PDF document text
    • http://fluorescent-training.com/file/48129626284.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/97747963865.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/56565961905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=proxy+free+download+for+androidPDF 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_off0000acb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C9 10384 bytes
SHA-256: dfa0562a9a655ec0b5234756dc4eb3e29cabffd31dd53876e3f5726f575bacfb
font_02_sfnt_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 14368 bytes
SHA-256: 9151df0afa17b9fc2aa36c90756cc48dd83685a0e8e35ee3848e116cc1f6a812

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