Malicious PDF — malware analysis report

Static analysis result for SHA-256 624fccec2c2a6918…

MALICIOUS

PDF

94.4 KB Created: 2021-09-13 17:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44606d375834c59aa2646d1cb78e96a5 SHA-1: 73b9e732ce9bc8273df56e0170d2c0d8143da043 SHA-256: 624fccec2c2a69181a57a9801d80796ca3cdcb5c1a8afca46bd555d8124dca67
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://natalieshuff.com/uploads/file/tigupomometawugofu.pdf In PDF document text
    • http://cathugo.de/res/wysiwyg/file/47922511356.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/92686382684.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/50568685514.pdfIn PDF document text
    • http://dentherapia.hu/files/file/nutoxivorodut.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/fawop.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/kebos.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/tuperofufumazuwoperafelom.pdfIn PDF document text
    • http://1carl.com/userfiles/file/29431514496.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/61146613256.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/zesovuvazitebovesofup.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/dofimuruboda.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/29299643772.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/mipuke.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/87986724594.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/dutaxujomexosojosebajuzoj.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/29107998031.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/45674733894.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210908_140218.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/repufeze.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/5419549767.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad7e039d3---40953702448.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/43337614141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=voice+of+prophecy+bible+study+guides+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 17980 bytes
SHA-256: 32aefa054e78ef392eb5c04f434e05d355706e3a2189a375e239f7f81b63c6f0
font_02_sfnt_off00015272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15272 10956 bytes
SHA-256: 3e5390df842c6a05c257ded28c7f8e8a92a418cf9d843e37c9b5ae425c63c82a

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