Malicious PDF — malware analysis report

Static analysis result for SHA-256 2263ff56ab3e6b1a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 03:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70418a1e7d92b744c5fee2b741509ff4 SHA-1: 2f854a11d0b7b094765e57271ba9823453d4180c SHA-256: 2263ff56ab3e6b1add9fc45e945c8c6858503d36903842421eae5d81ac47a2d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high number of distinct, low-reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=ios+13+launcher+apk PDF link annotation
    • http://studioguatta.it/userfiles/files/29759183528.pdfIn PDF document text
    • http://camonetinternational.com/files/file/vavapizanoxope.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/laneserejigi.pdfIn PDF document text
    • http://rinsacars.com/files/others/22590118524.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/wafidusanalavadefav.pdfIn PDF document text
    • https://mashura.co/userfiles/files/repugozejajimurojisaro.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/13159919098.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/zokixuzej.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf1abefb19---46557190838.pdfIn PDF document text
    • http://maulich.vn/attachment/files/32116474929.pdfIn PDF document text
    • http://tai-group.com/upload/files/95909728313.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/mukinutumixokapogi.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/muterujoxur.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/wakafufuxob.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/kipuwobe.pdfIn PDF document text
    • https://songhong.info/userfiles/file/xirijigop.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/8cohlkja9lm9ectfsalgsu8ks6/18909947579.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/fafawigebomitujufusituje.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/dunuborotoz.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/lidizosolajipejor.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/wuriberujofexumiruvusumu.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/4650458250.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/dokituvabifiniwamirenu.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_off0000ae83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE83 17400 bytes
SHA-256: 6de82c2a961de4717934e3178a26785e9677ea3d34d0b193614a10644bfa7d05
font_01_sfnt_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 10648 bytes
SHA-256: c3ac9b4608acb0c631c190d2f3b2b1396f89c03606f9221132c481143ce01036

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