Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67a180b912daf4d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 03:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b90ac4df773d83c919ebac0cfcbbbde1 SHA-1: 2a878f146e13da9e2695428fca8b1b7b21d7258d SHA-256: f67a180b912daf4d01fae5a5e0301da9de9f8366fe2bce3e4ab8624cdaf78997
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and a large number of external links, many pointing to potentially disposable hosting, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://s4l.vn/storage/ckfinder/files/55912647892.pdf In PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c55c665e777b45fbb073479917f7a30f/takopafitakekikegenadov.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/66916570986.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/bexevesoralorizesege.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/87008522439.pdfIn PDF document text
    • http://simonide.org/userfiles/file/ruxurawixisevusovulas.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210909221254209.pdfIn PDF document text
    • https://profesa.net/userFilesfile/simofev.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/21445257242.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee2fd59fc---48990236093.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/20896612173.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/49536867688.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/lepevifufagowuxaka.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/83409606094.pdfIn PDF document text
    • https://birudongker.com/contents/files/37357818355.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/xizuredibejowodav.pdfIn PDF document text
    • http://vecsecity.info/editor_up/40582434238.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/70244445503.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/94353686016.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/13716126538.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/depalusopuregarumi.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/tileveninabiwazosofetunep.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/87268114838.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/nogifidusa.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/13236427276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+delete+downloads+on+androidPDF 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_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 18000 bytes
SHA-256: 33d437d1cf24f8e87b8233aa83f3d7962fae47c952b0ca627d65c49b57d3fdcd
font_01_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 10320 bytes
SHA-256: ce43ce1dbc785ecb08b860d8bca6920ac83c3d5e5c5aa44dfd8c3edd1c9121d0
font_02_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1