Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d26e29f73b369d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 23:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 518c51d4749ce9050337c2065af7765d SHA-1: 838dd852a75c00ee167395fb2ccd6d542db86704 SHA-256: 47d26e29f73b369db0bb49b0e5f0625a9dd69e3316ebb6a551c8064c89a3c353
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://towa-aaa.jp/userfiles/file/84085527709.pdf In PDF document text
    • http://yonseri.org/userfiles/files/81466578654.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/pajokoparijujivugemuz.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/49606293585.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/99620397270.pdfIn PDF document text
    • http://slsnn.ru/content/file/jizijokujefixunivasugadi.pdfIn PDF document text
    • https://angem.fr/userfiles/file/seritatige.pdfIn PDF document text
    • http://juncheng.tw/upload/files/21943235648.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/19600422080.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/zirovepeges.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/makebapabunufajanirif.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613977b45a25b---70416503280.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/93605123471.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/ziwadafunudefi.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/38306575937.pdfIn PDF document text
    • http://medrea.ru/upload/files/zagixujipigek.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/33729055877.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/22158357402.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/vugogifubogarepidifavebiw.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/13646672918.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/nepinemowugije.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/16516178686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+google+docs+viewerPDF 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_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 18256 bytes
SHA-256: 503b81a2ca092c5b126dc86103e5cbbde3bb24d9e34a1a66ed20f7acd434c7c7
font_01_sfnt_off000113dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF3 10416 bytes
SHA-256: 9232fcd9aa2555d83ec95c77183c7ef086b4c255eee05159ed850c16c2550416

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