Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2b9ed191e5fd1b…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 16:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a7c9b8a581d61a28b5650e86ee3d0371 SHA-1: 03a9cbd595c8d7f0814c097e4554485cfd6c5a21 SHA-256: ad2b9ed191e5fd1b68301c93d3fd99e07d6c444e3ddf8b2a1a3104d26972b476
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs, one of which is specifically designed to lure users with the promise of 'paid hacking apps'. The presence of multiple disposable hosting domains and UTM parameters suggests a phishing or scamming operation. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://garglob.ru/uplcv?utm_term=paid+hacking+apps PDF link annotation
    • http://candientushinko.com/images/file/fefazi.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/11821623414.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/beduxedefuzarorak.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210926172713.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/46556524480.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/96588926899.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/33407381126.pdfIn PDF document text
    • https://okul.gencreklamajansi.com/uploads/files/nivepefekaxemubosivusibap.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109031610187310.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/fezidelurowu.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/15572129149.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/fizeb.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tuxidow.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/1983699761.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/pelukojezisobefivesefav.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/68219907769.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161480f74da3de---zajibometexeri.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/palaf.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/66173003392.pdfIn PDF document text
    • http://flexa.cz/docs/file/koxuxarakutu.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/rolabinu.pdfIn PDF document text
    • https://sergiomauri.com/images/file/tonobiwarapadukobo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c4e2ca1d10d59720ec47b52bedd22855/sibizuvafewoti.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_off0000ad34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD34 15268 bytes
SHA-256: 2a65de9b19e7b930e0d9ece19a5062a473c77e96333b4c547a69f09769de627f
font_01_sfnt_off0000d387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 10388 bytes
SHA-256: c2cc0d294d491bcc0fe658650fbdafb096945b663667a80a75244197b59954bf
font_02_sfnt_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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