Malicious PDF — malware analysis report

Static analysis result for SHA-256 c296601926ac3998…

MALICIOUS

PDF

75.4 KB Created: 2021-09-08 15:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9cce24461dc416b042956da2677ca53 SHA-1: fc0b973b29d772b9bfc400c7d0118dc583e3a19f SHA-256: c296601926ac3998b63646535b6123c64f582a1146502e9d485d86a0dcac82ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content, though heavily obfuscated, are indicative of techniques used to host or deliver malicious payloads, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://speak82.com/_UploadFile/Images/file/femaluvawivirosulem.pdf In PDF document text
    • http://finadev-groupe.com/userfiles/file/53550968479.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/89952609195.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/melerowubijobujeso.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tasozuw.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/8116715139.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/26030321876.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/28456752456.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/rosakanajosizoreni.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/94259552992.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210905235641.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/66671646922.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/lelosebijasilurevela.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/pupadawituri.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/39892428704.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/20534668166.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/gigamedafibofufe.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349d25d289a---xogawogesubal.pdfIn PDF document text
    • https://serka.com/serka/upload/files/rugiwejel.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/mejufiguvefekuxan.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/jebozodegavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=2005+porsche+boxster+repair+manualPDF 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_off0000c3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BA 16440 bytes
SHA-256: d8db09405f122b77bd1ab6022144e587411e8702698f22d930b62e72f2c39681
font_01_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 11260 bytes
SHA-256: 51bba8bd3bbde08ffead97605ea9841a54381b86d6721d69acbce15814c2e9ad
font_02_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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