Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d2fef7527076bf…

MALICIOUS

PDF

76.8 KB Created: 2021-09-28 02:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5eede84e0dd5abdfc19fba0aefa435bd SHA-1: 047541c65d47a1c7e5c700bb5890e83de383bd8c SHA-256: 10d2fef7527076bfed090e7c94b3fb7ed1b0364384e442f667c5391564350349
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. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF's purpose is to act as a deceptive gateway. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://wastran.ru/uplcv?utm_term=pes+2013+apk+%D8%AA%D8%AD%D9%85%D9%8A%D9%84 PDF link annotation
    • http://cuahuyhoang.com/media/ftp/file/28235029143.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/45229782178.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/83745645196.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613df27b8e0e1---nexavadudemekagoruxus.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/fulogevexagilujo.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/sesupiguzimilugiduzepox.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/goposunikelefejure.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/sejosik.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/fegafu.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/sezanolabitus.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd15976492---zokubovogawomiloxuwasog.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/vejetejeje.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/4267004108.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/81991435109.pdfIn PDF document text
    • http://rabwork.com/media/file/67561160003.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/96012062819.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/getufajefoga.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/29547486426.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/87077900890.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/36675517065.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/80610020659.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/7870574999.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDC 16860 bytes
SHA-256: fa1fd2b777bf59e99b15c35db647462a8e38ed701dfa594fe7f90912985e0241
font_01_sfnt_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068
font_02_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 17400 bytes
SHA-256: cb083acc6b33d487e164268c96285e2854009b106ec2822576d83d0cb7bebe62
font_03_sfnt_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 10244 bytes
SHA-256: 36888d2eab001767d7cb4d8f8ce41c2101bb071f56d6cbb2079f7fa9cb87993f