Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c41c80088a65d5…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 12:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 12772a8cad6ca7493115f2e86b269828 SHA-1: 91bf2cd2d755cc78706ade509c7a38fafc76a083 SHA-256: 93c41c80088a65d5c62a196ff8ce7de38fbff53b476e8a0b6e9acea32be96491
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://cructi.ru/uplcv?utm_term=easy+guitar+tutorial+for+beginners PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16139717b34eb0---6199724881.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6141fe71e9ccd.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/60340395856.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/genewito.pdfIn PDF document text
    • http://arablift.net/userfiles/file/lusokavofov.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/kubew.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/vugemomowote.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/sajedimetano.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210920_164733.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c9878a3d9666154ef6289ad692830d18/47430340727.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/37696912963.pdfIn PDF document text
    • http://arsvet.ru/img/upload/49711778674.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/18727937347.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/47551311847.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/watexekelu.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/15255422522.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xepotani.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/vekakomagaluzuwozozore.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lukejip.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/rafamolan.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/69419634571.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/7693401636.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/dekemitibunet.pdfIn PDF document text
    • 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_off0000ae11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE11 16252 bytes
SHA-256: d516374659675dc7c62bd418c05564f8fe05732309f6e06ff5b302cd5a6c69f3
font_01_sfnt_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 10724 bytes
SHA-256: fd94d8139e3a0731f62a4355ba0260b288dde10a37934e5bc2facadefb5c0030
font_02_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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