Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9b12b5ba19d8fc…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 07:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 01b9630292a959ec37cd4d1573b609dd SHA-1: cc5a31f25ff5a9c18434ddbe19031728933aa84b SHA-256: 0a9b12b5ba19d8fc1964318d69073ec8c4019a9389d725bfeb0cfaed7322bfe6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including one identified as a link farm on disposable hosting, suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques commonly used for initial access via malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mirrorlink.com/public/files/files/41136917060.pdf In PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/27498223660.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/ferewinamarepiwaz.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/winigobaba.pdfIn PDF document text
    • http://ctm.it/userfiles/file/mazizitizute.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/renotepoporoka.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/mizafu.pdfIn PDF document text
    • http://contelex.it/userfiles/files/vezuwenezuj.pdfIn PDF document text
    • https://defi128.com/userfiles/files/5758247734.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba0d8341d---zulaf.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-27/20210927072145847375.pdfIn PDF document text
    • https://cargotavio.ru/files/file/22502219508.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/ratasasefe.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/6812583822.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/dijoxilidomisisaxim.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/99370031135.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/22700128077.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/84999695313.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e588da148db06c955532de12e31453f1/15140167626.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/wutudowid.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/wetitutoranupakomo.pdfIn PDF document text
    • http://serting.eu/userfiles/files/76304109425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=new+valorant+weapon+skinsPDF 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_off0000acf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC507 17336 bytes
SHA-256: 20576d7d1137c3a614a0a4442c1187a23de5e623b60546c11d2f9f2783d5b018
font_02_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 10468 bytes
SHA-256: 98eb4c4da0988b1432432f83bb1729ea147558dddb6eb8ef4e85d4cfd35d2972

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