Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c12a52d8bff7ee…

MALICIOUS

PDF

70.3 KB Created: 2021-09-30 16:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8351208ff5b431b3cb5ea13758b71b43 SHA-1: 60ca2a2eb00ad9423b3434601f97f46071b76598 SHA-256: d5c12a52d8bff7eea84c1b09fade4503de478815d835cb1890298e3f0d704ba2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=windows+7+home+basic+product+key PDF link annotation
    • http://netmutum.com/userfiles/file/93899312228.pdfIn PDF document text
    • http://autodilygood.cz/files/file/lezabovisarexezomag.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/92650027439.pdfIn PDF document text
    • http://coumert.com/images/file/vuboxosur.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/11985700144.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/palixamasefexilurabo.pdfIn PDF document text
    • https://hojoairport.com/images/file/29835915804.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/zuzaj.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/samazepen.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/33789916278.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/xununuvusig.pdfIn PDF document text
    • https://firsathosting.com/calisma2/files/uploads/18479434963.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210919071202_1422451872.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/zozisiparamagovofoxomud.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/13179272273.pdfIn PDF document text
    • http://contua.org/userfiles/file/fifezanitukuzafagukob.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/87578653776.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/61664165276.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4fd1e042d6c6dc8788f475bdbebe21cb/39162217469.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/dejekadezifibutadut.pdfIn PDF document text
    • http://ttc-investco.com/img/files/ziladavanarelubemegoko.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/ximefufuxoridivoxujofe.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/35305181489.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/xolazogolopoxizaluxazif.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_off0000b097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB097 11308 bytes
SHA-256: b5950d8cbdccb9727cff6616e4d4fc32acdd60acfbf9f8f554c59436f040a3ca
font_01_sfnt_off0000cae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 16220 bytes
SHA-256: e62e9f2fd31a1a07598884b63e2c93d198a2710d2c1d9a3ea9ec054338770ac5

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