Malicious PDF — malware analysis report

Static analysis result for SHA-256 d355fd05b99532bb…

MALICIOUS

PDF

89.1 KB Created: 2021-09-20 06:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0287368fedc4ed48b798202f05d49f94 SHA-1: 9ebee21f87980d8d4e9e98577447f30fe15df8bb SHA-256: d355fd05b99532bbedc87089ca64fe1af16d10197d5b59559a6da38ba949429b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///vexavasatus.pdf In PDF document text
    • http://z500.si/files/wuren.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/41152879072.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/badivizijinalisibewaverav.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/pojezubevim.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614602b028a08---84566238531.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/difipexifi.pdfIn PDF document text
    • http://strandedtattoo.info/file/lopapivejefe.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/59623708397.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/zolilewejebi.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/betaduf.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/binok.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614293b249ebe---55121763444.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/92842719593.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/27617849140.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gojanoluwuf.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/68803901689.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/bufadew.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/lujarataxesafirum.pdfIn PDF document text
    • http://compsult.net/userfiles/file/xelowexumuvamivaga.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/gugunisazo.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/sikudiguju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=serp+rank+checker+freePDF 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_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 17632 bytes
SHA-256: 6e1dc9bb20b82ffade9ef0c210eb3ab711726908f0c7e6d353a15ec6762d8dcb
font_01_sfnt_off000127b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 10220 bytes
SHA-256: 89b60c899b4d77bda518797f3bfce326e182ed42c8ea5093fcd1e6e3c120aed5
font_02_sfnt_off00013e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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