Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40ce118ad6bb397…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 08:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d63bc7871b1fb10517cc965c6d75d4a4 SHA-1: 36fa7a8aec39e6fc66fe6b53332574dfebdda23c SHA-256: d40ce118ad6bb397ca4bc53172323007e48dfc28417f8ac26b18fe5100d8ed60
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/wakudepogorofilej.pdf In PDF document text
    • https://pmsp-me.com/userfiles/files/rufewu.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/20883349823.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/talowatuxalibozekobepe.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/gimawepiwuk.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/gujenawomimoju.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/15410527643.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/mewekup.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/goluredunip.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/luwanatamepasujomumelif.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/xubilazupigimikur.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/94678175517.pdfIn PDF document text
    • http://jfe.hk/userfiles/94184027317.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/66062333941.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/86149585608.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/35652658064.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/remumomeratumedipuxakenod.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87e38e972---66597117.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/rimoxiziwidenizafe.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/gadiporozipetaxigeb.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/binatolevozuselutadusil.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/23939239497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=indian+movies+eng+subPDF 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_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 16900 bytes
SHA-256: 29c7abacc31e39eb80b07fd38da52ee2437206413aeddc6ff9a9239b0c127785
font_01_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 10604 bytes
SHA-256: 933b6e1c2f13d7f29ac5e217aa7ea3d92a02a654dc65f50c8f0c10e26d067b91
font_02_sfnt_off00012b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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