Malicious PDF — malware analysis report

Static analysis result for SHA-256 e60b2282da6caa4a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 22:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 778baa5fc3582300df5f16309dfc3fc2 SHA-1: d762e858d4ab313ecd253812208219da2fca08d0 SHA-256: e60b2282da6caa4a97ce13ff1d293168dabf852b235738e83ba17f8e469f265e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate malicious intent, including a high ML score and ClamAV detection as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to potentially malicious domains, suggests an attempt to lead the user to a compromised site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16138d878eabc7---54699605484.pdf In PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/6557340161.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fowujefepuje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efea671488---tubagifepobevovej.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/42220114509.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/96696393223.pdfIn PDF document text
    • https://highrise.pl/file/44411153045.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/88315881122.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/kagifezutigijetuz.pdfIn PDF document text
    • http://packturf.fr/files/xasifotaxamalugetenoniti.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/16231912740.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/65108261103.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/81396328140.pdfIn PDF document text
    • http://etnorom.hu/pictures/kupusojiturobinesanig.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/83488543025.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/xesegefuto.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/lideri.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/lazovesiz.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/lorifematazuzerobibugu.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/fuxetolowugivilodenuxa.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/42620028066.pdfIn PDF document text
    • http://blueyee.com/upload/file/100356213746.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/24142986219.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613B5E5D1B1BD.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=moral+stories+in+telugu+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C1 21612 bytes
SHA-256: 03f2e5c220a3fedf1ada04a1a5770057713148ebdbfa6323ad20e6d13fe4e9f6
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_03_sfnt_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 10764 bytes
SHA-256: 3a216513473fbc3227579011ae0f1b6b7620f6c372e40086ff4409d940528889
font_04_sfnt_off000128b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B1 16380 bytes
SHA-256: 4460ddc4cf326191c1dd5eedba304e049eaf51deb53841e208d7e5786a7b5f0d