Malicious PDF — malware analysis report

Static analysis result for SHA-256 6548790d0e679c31…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 11:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10039beebef0dc074165589927ace45f SHA-1: 924160080751323941be13863444d2a599487f94 SHA-256: 6548790d0e679c3182b6f5a7004b3a00a99e0bd365a22a22d83d5f8b7cc804ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on distinct, potentially disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://armature.ir/cache/fck_files/file/totidekelo.pdf In PDF document text
    • http://siamsankyo.com/Uploads/file/24749611416.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/94983128857.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/20194324045.pdfIn PDF document text
    • https://12shio1.com/contents/files/nimetinepuzubetonivifukel.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/bokivalobulamuzamago.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/58413156835.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/74999641016.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/gezofasijazogetetijati.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/16721548900.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/l770gencgpeb7f7pb3m5ah7kho/67782648979.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/39550410604.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/8954367064.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/35305469503.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/jalisopup.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/welob.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/xutaxo.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/32846323932.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/21130276475.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138941301e0b---1712238705.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/fojevinusolivaberaluvu.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/pevanotugejaxux.pdfIn PDF document text
    • http://skncn.com/u/files/nodulosogatadew.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/62423315607.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/39006042484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=std+4+english+grammar+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_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 17964 bytes
SHA-256: bb30762a20adea728ccbd1bee2e27c3611b726059ff4bcdd91842261db72a0ee
font_02_sfnt_off00011ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADE 10980 bytes
SHA-256: 2a9fa65cded6084275781faf866d5fe1ba9639de207e436ffce4a3385d8361c4

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