Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2021898f9777379…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 16:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73dbeecc2510b055336e3adcd5ce94e7 SHA-1: 971c8d56791181cd9b728923dcbb724d161aef77 SHA-256: d2021898f977737932281c8e05205da56e76f6388b60253557ea66fbbcd1d095
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the true destination or distribute phishing content. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://joinvita.com/neu/userfiles/file/sanezovenejagukij.pdf In PDF document text
    • https://manuscripthandler.com/userfiles/file/wixuxibipomikasilukepel.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/36091941499.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/bedoparazozanivozaw.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/mizenepewusujejisod.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/jerot.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/31831486022.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/32823625824.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/pupesalelorisaba.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dopusuxa.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/29344128269.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/57048840875.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/77273171878.pdfIn PDF document text
    • http://momsystem.ru/public/file/doxoxanagegipuf.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/49921890272.pdfIn PDF document text
    • http://praguetransfer.com/files/file/43869571385.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ee49753b06de45c6ed726b57d71e4cdd/lutanamu.pdfIn PDF document text
    • https://dafelia.com/files/zurozu.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/vudojirapexubagemopelusip.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/lakovufufitugere.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/74333274946.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/51685594194.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/biborana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=super+io+gamesPDF link annotation
    • 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_off0000ad96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD96 10520 bytes
SHA-256: 96c31723cc9467d2848b947b7bf87dc3ccf82dfaeee934c654c300f1969780e4
font_01_sfnt_off0000c583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC583 14696 bytes
SHA-256: c5f0f1e5cda463b3ea06eafbb156277d61d4825d69300836339e1058c49eac98
font_02_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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