Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a205b92befe23a3…

MALICIOUS

PDF

67.9 KB Created: 2021-09-20 22:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a461c751b8e5b331141e12ad4c5382c3 SHA-1: 43954ad04226665cf641561176c0dc8901e1f58b SHA-256: 8a205b92befe23a30a18c8f9e6f48b401efe32bbe120dabf8de355fabda77d10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing campaign. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=pubg+korean+free+download+apk PDF link annotation
    • http://shyjjc.com/v15/Upload/file/2021912411452707.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/pivilakusivabirur.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/ziwiwedemozifenajita.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16145fdf21c341---87827245668.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/76687218050.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///42368466804.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/86492247864.pdfIn PDF document text
    • http://fkhd.cz/data/img/dewarizizexuregorepazi.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/80851605727.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/filavemunevoxejota.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/95809929536.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/24638991028.pdfIn PDF document text
    • http://turatabor.hu/media/xaboxojomodedo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16136659f56c88---xegifeloviko.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/41712285228.pdfIn PDF document text
    • http://beta-rc.com/upload/files/90573174556.pdfIn PDF document text
    • http://vtaky.sk/media/file/8981266302.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_off0000abfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFB 10732 bytes
SHA-256: d9136f1bfcd330f245fefef3e24d8b22e112bef965a79ab346529d21e2cccb60
font_01_sfnt_off0000c467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 14964 bytes
SHA-256: 878885f77fb7fa4d3b60742b0ad99bc203e1443a1317a3371d3c358c3510aa2a

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