Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d6f14b9862eda2…

MALICIOUS

PDF

77.1 KB Created: 2021-09-29 02:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98ff88b6db0b9a9e7b2775f40fa90b07 SHA-1: 4c334d39bb3f75e0400c03c8021cc2a2868e91cf SHA-256: 45d6f14b9862eda26411cbcb1d4830ae8670aa57ed217ea8b1681f4b5da28b16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate an attempt to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=crazy+shooters+2+unblocked PDF link annotation
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kesotevimuwupitov.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/mupigesufiwe.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/radiribezigalor.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/perebadisokunezaje.pdfIn PDF document text
    • http://haphadoor.com/upload/files/28695677591.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161489ca928940---71387019082.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/89160746933.pdfIn PDF document text
    • http://th-hl.com///upload/files/63367848607.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/pigiretajipefesuvelun.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/17178946186.pdfIn PDF document text
    • http://jinyezi.cn/upload/jevopivelatebetefow.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/lagotasuwazewaxe.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/75559833994.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/9906967530.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210915_D9111899A8DC7EC6.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/finekobobar.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/kobewed.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/givesuletaxewibijimibe.pdfIn PDF document text
    • http://miminku2.com/contents/files/zinomavodotoxalidi.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/94010231679.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/94685890521.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/44200111455.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_off0000c337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 19104 bytes
SHA-256: 58cf8e352c7cc4dcf616504d83d43742faaafa7777f68d78be347172ad1eb9d6
font_02_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 11032 bytes
SHA-256: 22d8c55ffc440fd1f86629cc32a371c1d6809a94c3f3477615c37ba7149354c7

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