Malicious PDF — malware analysis report

Static analysis result for SHA-256 db42305c43c8198f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-22 23:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4fc6d965cda280a94e02124078c43e61 SHA-1: 223c7fd6742b06d8b4698687638d15337bce79d0 SHA-256: db42305c43c8198f87353e6e30ea03617f9a7236a7c32cad6e5140ed5f07e7a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one identified as a link farm, suggesting an attempt to redirect users to potentially harmful content. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fukaofoods.tw/uploads/files/202109071808359420.pdf In PDF document text
    • http://studiopedrazzini.eu/userfiles/files/86621671527.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/24215995893.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/61024976386.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329133cfb43---90509948704.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/fuxifu.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/migowaxelesuvewupezis.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/26579523518.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/bilevanuna.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/rafidatasusu.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/40543492615.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/87920314260.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/fesonolurapokupe.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/4618145129.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/bowafogodomumamomuv.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/butikawitufiwuf.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/11898006064.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/2601398150.pdfIn PDF document text
    • https://jagominum.com/contents/files/romijizokarijusubabiwuki.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/kalaluxulanan.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/jutisawurafukutomi.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zevuwenor.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/29754245230.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/98673287897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dany+tv+box+price+in+pakistanPDF 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_off0000bc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 17732 bytes
SHA-256: 76670b018265c744474861d752047cea3b3e7c6edd459a30be295d0227521861
font_02_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 10836 bytes
SHA-256: 850b9d2be4092a0688b13e2f9c193f53ca82ab885256c32ab4de065a12f29379