Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0ce30e1c5c25b0…

MALICIOUS

PDF

96.0 KB Created: 2021-09-12 15:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e69846678a44dbd86e4076a3dfe1aae5 SHA-1: 51640dc07a14767ef81fbd760a0ad20ae2ba6d1d SHA-256: 3f0ce30e1c5c25b07087e6ce057a59d871f0ba336c661113815add712cdd221c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded JavaScript and a large number of external URIs, many pointing to potentially disposable domains, indicates a strong likelihood of malicious intent, likely to redirect users to phishing sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://pasationtravellers.com/root/FCKeditor/file/vuguboditogaxezudino.pdf In PDF document text
    • http://faceconnects.com/ci/userfiles/files/20345969103.pdfIn PDF document text
    • http://edituj.cz/res/file/71599149422.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/90505064618.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/13246638551.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/nagumuxera.pdfIn PDF document text
    • https://digireg.cn/upload/51604356015.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/kerisavixesonabebizejed.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/duxaxiradumatanawizim.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/gidusetujonevoxusopuxome.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/kusoxabid.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/dawomita.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/peleji.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/79774654168.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/dizaw.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/66993237925.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/nediwigitilibuluketu.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/35931166769.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/76995084744.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d106f06473b2bc344036b724acc6ac88/27619943420.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/98464763240.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/76234726653.pdfIn PDF document text
    • http://vucert.vn/uploads/files/nojofi.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210909_5B9E8BAFFC3E67B6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mejores+juegos+online+android+gratisPDF 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_off00010e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7C 20104 bytes
SHA-256: 929eca2df6cd66b3b878565216cb092ead1cd74c0fa653dc645f5f25fd6b6377
font_01_sfnt_off0001416a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416A 10648 bytes
SHA-256: d7879b28d53f4440c7ad71aa307a7992e633972970224f990b6b7086b964b400
font_02_sfnt_off000159b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1