Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32effa7edd0becd…

MALICIOUS

PDF

87.2 KB Created: 2021-10-09 16:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 472ebdb65c024632c490209929988e15 SHA-1: 9b38b193b776de31de9645c012ba20429353bcfd SHA-256: b32effa7edd0becd955eb3931880daa0ad77b80cb108f1b09c2c54f98baea858
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious, suggesting the primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=mcq+on+crpc+with+answers PDF link annotation
    • https://valve-toho.com/userfiles/file/fisimip.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/mepibepizimo.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/27357977621.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/55776081222.pdfIn PDF document text
    • https://servicenter.ro/ckfinder/userfiles/files/41173186936.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/pinanaganifirateko.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/dovokasuwevubafiz.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/30910152657.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/jujepifudulu.pdfIn PDF document text
    • http://devveb.net/userfiles/file/26742429177.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/51800762361614dc0cf32d.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/78735317090.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/9mqujv09k4q38rsfuj8tu52s3o1cgaac/lojimeweludoju.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/45263249592.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/fobujemo.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/39343174478.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/piluzevatuwisulo.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/fesapitegidekimi.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/tijexobarezafeforur.pdfIn PDF document text
    • http://baove24h.org/upload/files/71772231758.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_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 10652 bytes
SHA-256: 30b76963b80ac2d3a1651da5f6b2975efa0f6ac14ecf60aa76d2757a1f5c96d4
font_01_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 18980 bytes
SHA-256: d99b2fc11b0ff5b851b2c5573921c794293ff785e2d0741c20c1ec0693ca546e
font_02_sfnt_off0001363e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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