Malicious PDF — malware analysis report

Static analysis result for SHA-256 153b363cc76b923c…

MALICIOUS

PDF

87.4 KB Created: 2021-09-12 12:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdc7ad9cee952ae8195599a21836b8a1 SHA-1: c0ba5779faded45b2bbb6e005dd2491e6d0c5d4e SHA-256: 153b363cc76b923cebbf4dc2fea119eaf5b0fedc6f84b9299c60d7d256a440e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. This behavior strongly suggests the document is intended to redirect users to phishing sites or facilitate the download of additional malware, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://akiisushi.com/uploads/files/zugerifejitelusoteb.pdf In PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/tekipusoxuv.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/8482695258.pdfIn PDF document text
    • https://codecs.ro/images/file/64477105939.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/fagap.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/44513666975.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/mupetabapepuvopevofalir.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/kodijulitunagukaxer.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161316a6e2df42---julobojafabi.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/vutadexidogojaku.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/14750155950.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/82663966240.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/77545928099.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/bekuzajarotu.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/womakawod.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/bigopetibanupadilidebop.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/79199692472.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/66944892186.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/xejibivagarufugegura.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/puzimojodenukazivib.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090616180324.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/48340040835.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/66543255009.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/63948262958.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/3965883311.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/15672131651.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vivumogilazonisado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=modern+strike+online+free+downloadPDF 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_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 10520 bytes
SHA-256: 118e0cc2f95cef08d9bb914fd0059a54b496fefd8e1ef7b8fdcaa20c6b5c56a7
font_01_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 18836 bytes
SHA-256: cad3fc3f78f7a206ef5c36b13eb04165c180f9f1b7a163e8db144e9684e9025f
font_02_sfnt_off0001377d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1