Malicious PDF — malware analysis report

Static analysis result for SHA-256 82470656803f44c3…

MALICIOUS

PDF

79.4 KB Created: 2021-10-15 08:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 11e868f5c1ee646cfc0d40e71472fea7 SHA-1: 95d040ed37093167f2cfd326d545d023f85e9853 SHA-256: 82470656803f44c3c913a02c6baefb7b2c5204c6d25b72524be0bc35ac8f66fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm designed to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://caphegiabao.com/upload/fck/file/pikexel.pdf In PDF document text
    • https://mediaget.ru/userfiles/files/kosamagifobagib.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/vobogejutukujiboleme.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/96277587029.pdfIn PDF document text
    • https://fasaac.org/temp/files/waxedifemixizurifal.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/xuwinew.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/57074515649.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/peliripa.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/nulul.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/loregugapawobabomuretus.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/fuwubopune.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/63597871781.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/depetazi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161650d90726a4---87044578121.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/vumadoxazebekut.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/95439046471.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/87790988034.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/jiroxigefogoradamad.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/46532352210.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/80565051051.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/gunakapufawonuzuwajefig.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/70441755381.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/lufowaduginemusa.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=addition+subtraction+worksheet+for+class+2PDF 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_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 11092 bytes
SHA-256: 2e96f98c09b6cb08b65a953856e718b81cdef7065ef127068943cadb8adf04b2
font_01_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 17040 bytes
SHA-256: 461fcd3499594eb2d395d3d07b130c1eade6ff0cae89fb21f46dc96b607b4020
font_02_sfnt_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1