Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75c850a462725bf…

MALICIOUS

PDF

99.7 KB Created: 2021-09-20 09:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 581ac2cd1c754e2de2a065b5d9b0f227 SHA-1: 15a68d5808aa01e4e84ad3e2a36b975aab7738e2 SHA-256: d75c850a462725bf8e9dde1973ac0d96433e32cf903e533c6710c9a68421a479
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm with numerous external URLs, many pointing to disposable domains, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a likely intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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://073741256.com/uploads/files/202109161229407987.pdf
    • https://krygina40.ru/UserFiles/File/95873067872.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/xamega.pdf
    • https://kasihpaham.com/contents/files/disunozomunuti.pdf
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/borosotir.pdf
    • http://kajo-frings.de/userfiles/file/8845133487.pdf
    • http://kite-surf.sk/files/sigube.pdf
    • https://qian-ho.com/upfiles/editor/files/41538893793.pdf
    • http://hibertek.com/image/files/20210906_111715.pdf
    • http://vanlysecurity.vn/vanly/album/files/72379754656.pdf
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/mafulideged.pdf
    • http://hodinovysoused.cz/upload/file/mapiberosamejesekudufom.pdf
    • https://www.sistemkabin.com/ckfinder/userfiles/files/zutubiwix.pdf
    • http://nbc.com.vn/ckfinder/userfiles/files/kujizubojuke.pdf
    • http://falerisztika.hu/tmp/9862751614.pdf
    • http://mijn-nederland.nl/userfiles/file/rorirovafazazil.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/pubirisetexojuzomomarunus.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/82370448060.pdf
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/10584822161.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161390dc19a452---52878494339.pdf
    • https://mama-light.net/business_school/uploads/file/33425261742.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210918_ECAD4B1ACA3B2C5F.pdf
    • https://hospvetcentral.pt/site/upload/file/xexodobozalosixopuv.pdf
    • https://nadrozmerne-sklo.cz/uploads/gezasa.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f5f830b8---niganefuvoruvi.pdf
    • https://mr-alian.com/upload/ckfinder/files/padixakigojajuxip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=he%27s+into+her+season+2+full+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 16792 bytes
font_01_sfnt_off00011cb1.bin
1a23683c0f0962c3c62278fce33e56008fbbd934436a5ebd1b273b74780d2bd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB1 18856 bytes
font_02_sfnt_off00013acc.bin
9dc4479b546cca0c4cc1ab4b95f190856c692820f2fba6eed043ed0819b21ba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACC 10788 bytes
font_03_sfnt_off00015387.bin
e9fccd53687b90a4b9b00e1829abfdff6cfd63d34c2bdadf9dc2d460ccccd1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15387 17472 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.