Malicious PDF — malware analysis report

Static analysis result for SHA-256 688c8b229cb08128…

MALICIOUS

PDF

87.3 KB Created: 2021-09-15 00:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24c3a2c60daf32acd2c9c02041b1ab30 SHA-1: 61addc67dcea99df50ae451838202b06e14ec5ed SHA-256: 688c8b229cb0812851e11357eec6792c458d236109a1fc8db857b1e714767d54
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URLs, including one flagged as a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to malicious sites or the execution of further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=mr+drew+later PDF link annotation
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/45a42c0a6df26e5f1375271b35264457/35626608440.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/46704916913.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/82872436822.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/gizijefuxana.pdfIn PDF document text
    • http://vina2002.com/uploads/files/zenubafutozip.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210902024813.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210906025623.pdfIn PDF document text
    • http://unibox.lv/files/text/58722342836.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/xibezijosematapaburoj.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/79921372599.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/lurolesufenedopur.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tisoz.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161405b73f2db2---siparivojamebol.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210906215552.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/luxixuzofurisutivomub.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/mubag.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/lovekizusade.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/menerixunugatomali.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/96722614746.pdfIn PDF document text
    • https://davnosti.ru/upload/fobexixana.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89d3ee945---86468549233.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/burosuneligaditofokawokij.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/75724229571.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_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 18192 bytes
SHA-256: b72a9f45b3e7c4b3f998fed6fda5592ed128c1dd032918fadb63c12ff2004719
font_02_sfnt_off000139c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C3 9836 bytes
SHA-256: c2c72fc0cff390e8ee60299aca5b37470a75fe0b293bbcb142dc307d46632354

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