Malicious PDF — malware analysis report

Static analysis result for SHA-256 01fdeeb097e7df01…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 09:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72a80f0a9221bf1f780bf368cd4bb74f SHA-1: a04d2a263afeae9b95fa5a86b7783ddcd3701cf4 SHA-256: 01fdeeb097e7df016325098c0e0b1e0b749ac14177a12f18031234df35ef797c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection and a high ML score. It contains embedded JavaScript, suggesting an attempt to execute malicious code. The PDF also includes numerous external URIs, many of which are hosted on disposable domains, indicating a likely phishing or malware distribution campaign. The presence of embedded JavaScript and external links points towards an attack pattern involving user interaction to navigate to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://azstorestudio.com/uploads/files/posevofosibebu.pdf In PDF document text
    • http://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/68997037118.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/26231701560.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/munafunuwu.pdfIn PDF document text
    • http://marketingnews.fr/images/file/bisobafufat.pdfIn PDF document text
    • https://serka.com/serka/upload/files/puripuxezefajeverufeduwe.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/23005186154.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/vifina.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210906_030901.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/momotukutoki.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/91314653885.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/58180448944.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/39195781466.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/19249869757.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/26962379693.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/2295761794.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/pogegul.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/wiramolotufolodumi.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/83906928698.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/fivuzokafidew.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/tedizerakavokitovegevaji.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/degafux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+play+video+on+android+autoPDF 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_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 10572 bytes
SHA-256: 18b3b69e3a040b97675bd3a265b0c7659733035c73cbd63de5b343020bd21b87
font_02_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 19948 bytes
SHA-256: eb33cef4e6e1b3fa73c853bcc5be48df6389316fe26713c1ac0b23f6da0766b9

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