Malicious PDF — malware analysis report

Static analysis result for SHA-256 3300cb3cb48e5250…

MALICIOUS

PDF

89.4 KB Created: 2021-09-20 03:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b760dcddd032777adf0885e6ac9fe382 SHA-1: 52d46e8e412ec2d569023523ec59107bcd9267d4 SHA-256: 3300cb3cb48e5250d9db1df1256b4820c2882c28050143cbf420e27589f39084
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=top+guns+full+movie+2011 PDF link annotation
    • https://yaofangpeixun.com/upload/files/baromisawewo.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/demukiwefe.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911155100.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/96853507468.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/kirowazigamar.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/nalegumomaxaze.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/koxoz.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/61067572155.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/vukuviv.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/wijimobewagegotu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1lbheq1u1iffbh36qvu532hrq4/96807427692.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/55933220679.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/fizil.pdfIn PDF document text
    • http://sin-hua.org/userfiles/52408022590.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/12071299055.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/17330881072.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6cd92676bff095479620a5f3015fd906/levazugivi.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/xanewaxifolowigijeriziruz.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/9753658786.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/kiregixagapene.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/loboletatazinovog.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/87530182844.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/ribava.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/88633151437.pdfIn PDF document text
    • http://camonetinternational.com/files/file/savulakisaxumu.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_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 17912 bytes
SHA-256: 07b398a88f3357e8954c68055c1038f7a66bdae7e1922cd123784222edf6c4c3
font_01_sfnt_off0001265f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 10764 bytes
SHA-256: b993702859a3ff1cb737703cb09a993187b6fc2cc1792f8718eefc68b8cf0b4d
font_02_sfnt_off00013f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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