Malicious PDF — malware analysis report

Static analysis result for SHA-256 21feb60c89e693f6…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 09:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fcb3b2c08a28edd43df8da9e7bfe9e1 SHA-1: 9bf294a15b4cf9643f63ca21fdd46eafe27cb26e SHA-256: 21feb60c89e693f6adf7400a71d386276f18456d6e44845eabb461fe96682b80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, suggests a link farm designed to redirect users to potentially malicious content, masquerading as a driver download. While no scripts were directly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=download+driver+windows+10+64+bit+full+version PDF link annotation
    • http://tandprotheses.com/ckfinder/userfiles/files/14658021372.pdfIn PDF document text
    • https://bagstyle.uz/images/file/gejatife.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/92356248457.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/47230393930.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/151923218928.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/xadavobuse.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/nekurefobemati.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/diredafoz.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/radusuwodegakiwekex.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0810ee4bab3afb5be2f49e1b78d56b66/lipebojuxokisebewufo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363d0e290f2---mizadibofo.pdfIn PDF document text
    • http://jarosi.hu/files/file/87100072102.pdfIn PDF document text
    • https://afma.pt/site/upload/file/91598788416.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/xaguluxejuwebelukos.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/kajeviwapopoketaxe.pdfIn PDF document text
    • https://shibbirs.com/media/files/10014031381.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/6451609253.pdfIn PDF document text
    • https://bursac.net/userfiles/file/23858544316.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/lekexumixapu.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/70778102469.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_off0000c825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 18436 bytes
SHA-256: 72a1fe24573af95bc040903bc4400bcbd9c126e4405f08f88b434f9f91b9bc11
font_02_sfnt_off00011075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 11160 bytes
SHA-256: 75a65460f17b98569d6f9f46769064c786d86e195d0c46acf80dffbe0fd493ce

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