Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ec0012e8c6018b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 02:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27e0db04b816904ec9160db24a9c2b9e SHA-1: 367079ac9ed68332571b27629c463524e6041576 SHA-256: 74ec0012e8c6018b2c773fef78911e02787e7b29d3f0b46b1f2fa04a1396ed10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the primary goal is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=free+fire+apk+max PDF link annotation
    • https://hr-serdahel.hu/images/file/zinoveko.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/21974634776.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/xazitekiviv.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zevigakokubasuxejefem.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/11559395118.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/21486486104.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/35199030105.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66720509641.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/63c72ce3e52644fb6a3fabdf9fc7dc87/merapo.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/xutajuba.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/zadajesomijovolobu.pdfIn PDF document text
    • http://zubrcup.by/files/files/fabetawireve.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/83251721233.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/9147400495.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-17/85c2e82eab88991346792c3ce0def775.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136708cadc9b---kezubusezukulajofuviride.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/jawojobemut.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/fomegabediguwuluvud.pdfIn PDF document text
    • http://offerparts.com/upload/files/7840399310.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/60450252598.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/32570594989.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/vesusepakekapulivu.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/winutulekizanewata.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/limobasunig.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_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 18164 bytes
SHA-256: 81ac8fa2411ee9712ae2ab530ed38972e067b24db8343bc8288c92f66744c6b4
font_01_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 10156 bytes
SHA-256: 12e0b20a351229e47f667d5620c8041a3efd149356453eec445a8da225f875a0

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