Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a415811ef76303…

MALICIOUS

PDF

83.0 KB Created: 2021-10-07 00:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: abdc8e1222dff96f00c4bba44590d012 SHA-1: b6cc62282ab0b138e9c082824bf4ccae53cd9977 SHA-256: 63a415811ef76303b7fc928e3543f72a7884d4016968d982b2e7052b05cb984e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://inwebjor.ru/uplcv?utm_term=kick+your+arse PDF link annotation
    • https://monamifrance.com/FileData/ckfinder/files/20210912_A16EF6F8F23B459D.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/tabigitibox.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfe8bab0a1---xojevuf.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/lobutezafexuredeterujit.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/86944289065.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/41065260226.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/77682674110.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/3346828928.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/fejumanedaxebezomejegir.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/58680350125.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/tapevapefu.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/maxidekenaviwosu.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/gigelodimozuwok.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/98907319374.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/dodofivaje.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/60784480025.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/63448927944.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/41747145981.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/77282113097.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/milifiworawesef.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/48617994002.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/wixulu.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_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 19424 bytes
SHA-256: eaea4af54610fddcbe623e0b254908acada938fd5d8a0bb287ba577fe7544a6c
font_02_sfnt_off0001273b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273B 10272 bytes
SHA-256: 1d63cec83f5e3104cbe414a02d05677abf754beff825c49191560b2bfccde1a9

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