Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e708b29640726d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-18 07:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8520e13d61f8d33f2d48e481e54c856c SHA-1: cabd01e5023c6c7c63397cdf9c07f664d62c7c7e SHA-256: 22e708b29640726dc6d39eebe89d2f7c3031e7bb3058675df658d733a223f3ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stensoproject.com/userfiles/files/febagekuvetovotot.pdf
    • http://biaikatolikus.hu/files/file/gopenivovapabasovetake.pdf
    • https://hbfilm.ca/resimler/files/muruwuwomanegane.pdf
    • http://etalentlink.com/uploadfile/file///2021091304555865.pdf
    • http://k-sta.kr/FileData/ckfinder/files/20210908_875FB6193378DE40.pdf
    • https://casasholidays.com/scgtest/team-explore/uploads/files/98015783187.pdf
    • http://hoteldanang.vn/uploads/images/files/3279155776.pdf
    • https://nhahangbienhaitien.com/uploads/files/37400388409.pdf
    • http://yjccnc.com/upload/files/36053338787.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/90091186321.pdf
    • http://groupelamiri.com/uploads/FCK_files/file/vabumamupugilegig.pdf
    • https://equator-maritime.com/userfiles/file/24893907438.pdf
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/gekabefunepuresajilexogit.pdf
    • http://mishelik.ru/userfiles/file/88943133730.pdf
    • http://csc0532.com/userfiles/file/20210901182435_drv4bz.pdf
    • http://888chji.com/userfiles/files/65931356978.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161416514be06f---60220001804.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=my+hero+academia+heroes+rising+dubbed+online
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C7 16792 bytes
font_01_sfnt_off0000ccde.bin
cd16e0fd5c0332463a6f2f2103d92d9ec0b0fb8719ff8b873f2262a745e612c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 11064 bytes
font_02_sfnt_off0000e637.bin
1e2209c88ec49e146d5fa609028161c0457d9d330b027b56ebd8e0afb2faf8b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 19380 bytes

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