Malicious PDF — malware analysis report

Static analysis result for SHA-256 798da32159a7093a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 22:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: c6df26301872888ce9b0f84edbc920e6 SHA-1: f91674417fa81b34024c5fa6fef5b0a6046c3d49 SHA-256: 798da32159a7093a2f19e0f1248859fe7fac62e3b79e5838ca1874c9d2f3d79d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tradegateindia.com/userfiles/file/wulapinonokegizaliwemunid.pdf In PDF document text
    • http://getvisa.ru/images/File/fogidi.pdfIn PDF document text
    • https://premiersuli.hu/files/files/zogupapidigeta.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210905/file/16308577805840.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/nubog.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/wojinozorero.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/botofan.pdfIn PDF document text
    • https://mimpidia.com/contents/files/tozan.pdfIn PDF document text
    • http://blgjad.com/upload/files/51490986929.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/sidegokev.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/36182402884.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/74314577537.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/21088549261.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/jifiwamuzowatekeze.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/dipinewedebinobopikilotu.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/nizuronazedopozozipodi.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/sebabisotizizuvewifa.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/25088996180.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/35825906218.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wimanapawedalakiwedivanaj.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/7444515504.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/nawido.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/15842153190.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/nofijokexedodepaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=toolbox+for+minecraft+pe+apkPDF 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_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 17944 bytes
SHA-256: af646f75439425eae4483ef3eaeaa90350d6a780f2c40103da6e6329c205c934
font_01_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 10772 bytes
SHA-256: b65dab67f9153d48e36e2dff3f03d75f63fe6b8085f9e1f9091f3694076c21ff
font_02_sfnt_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1