Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c312efbeed451d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 21:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0f25f28ebf0b893adc68d9c5bd9cdfc5 SHA-1: 0f61e6d321d530606be640ee31ee2e8fb3fd7dc4 SHA-256: e9c312efbeed451d82ed8d7091938004447c724f43311a949e70328ba8ed00b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous external URIs pointing to disposable domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior, indicating the PDF is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://oniceh.ru/uplcv?utm_term=nintendo+64+games+rom+download PDF link annotation
    • http://uniquecharacters.com/upload/files/fepezekobokevuwiriz.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/noleko.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/19287728748.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/84036739485.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/1285934987.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/81846545187.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/67077791909.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90307041745.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ec17b383f---gibozekoliw.pdfIn PDF document text
    • http://getem.pl/files/file/mipalosusi.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/malovolubojilatekakex.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/11244642286.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/sefavivegopaki.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/xilubolajafokepuza.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/59019970369.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/38008907717.pdfIn PDF document text
    • https://jjpremiers.com/files/felusas.pdfIn PDF document text
    • http://safarang.com/basefile/files/sibelikumavabib.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/karexekamesonarukozu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/bakokimakelofatogo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96405ba93---51420529111.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/tinovifevuvavulev.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/78642360928.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/wudoresezugopibanokurig.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/pupelujetapilepir.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/46232573595.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/39396999411.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 17880 bytes
SHA-256: 77897f8b3e8b4b9ab3c7c8945fb60773ff8cfce1e3e6aa17ddbf5a2ef495c5e7
font_02_sfnt_off00012204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 10900 bytes
SHA-256: f0c97b59a40daf025ac5855bff0815a37902ccd8943eb8e2b7a5fc9a40692e86