Malicious PDF — malware analysis report

Static analysis result for SHA-256 5046f4896dadabb4…

MALICIOUS

PDF

74.9 KB Created: 2021-10-12 22:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 38e6179cf07abc7a59d9ac200914a78a SHA-1: 5cf87dca06a037a48d679738ca590e1f83da8f37 SHA-256: 5046f4896dadabb47eb4e669055f973f79d333046bd7037edf1c691c05600561
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to distribute further malicious content or lead users to phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://dalaichau.com/files/28310091398.pdf In PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/11905480700.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/655051693.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021100721152373499.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/17681717360.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/jusumovalevokubivelaled.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614912f9d21ce---55471225261.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/27133074245.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/47044008625.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/1543962060.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/puvuwewaviludup.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/89742792165.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/62636164229.pdfIn PDF document text
    • http://mfahk.com/upload/files/dototigidumeli.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35825096571.pdfIn PDF document text
    • http://ridendo.cz/files/file/rajaxevomasijite.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/39460675512.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/fakukefofe.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/jenilaxupi.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109211237108102.pdfIn PDF document text
    • http://lucca.jpsoftware.sk/upload/files/negaferifufijewuzo.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/53326873855.pdfIn PDF document text
    • http://jjteriyaki.iorderfoods.com/uploads/files/mizolebobex.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/73787803359.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=factorial+of+a+no+in+javaPDF 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_off0000bf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 10204 bytes
SHA-256: 9e4dfe5e6fb8ce346c6b7e03e8a426b422e6bccc226ce3ca328d1faa00611aae
font_01_sfnt_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 18268 bytes
SHA-256: 59ed33ed5686f08748d84c36f9a2bda778487d27a7d7aa33acbb4e6107d8b18a

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