Malicious PDF — malware analysis report

Static analysis result for SHA-256 f106f0e0afdf19aa…

MALICIOUS

PDF

68.1 KB Created: 2021-09-28 13:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 18b564e2a4262478cd1626450a8add00 SHA-1: 2497d257de92ee8a3f9ed307dba87a19e3e487e3 SHA-256: f106f0e0afdf19aa18384c0a6fa10881aaa401044fb094cb8cace0348c54d7e7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the high number of unknown reputation URLs suggest a malicious intent to host or link to further malicious content. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://habrit.tw/ckfinder/userfiles/files/44883163129.pdf In PDF document text
    • http://nasfthr.com/userfiles/file/muwunavedimekas.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/raginuriroxabep.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/zodufege.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/48344312920.pdfIn PDF document text
    • http://insei.eu/userfiles/files/rexalesixovuguletinuli.pdfIn PDF document text
    • https://tele-video.ru/upload/files/sojuzivijevuxolod.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/62590211183.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0a5b091aafbe33076e374932144d98fa/bajakori.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/jinabaniketexazi.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/43021611029.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/fojobitoj.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/87154380858.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/57907491483.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/dufurajekaze.pdfIn PDF document text
    • https://upaspor.com/resimler/files/relixuvajewi.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/sewawu.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/45835782205.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee878a923c---sobaniketosojudibataxu.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/22871265056.pdfIn PDF document text
    • https://salwangurugram.com/files/44597555005.pdfIn PDF document text
    • https://suksesunited.com/contents/files/90079829687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=v+recorder+mod+apk+no+watermarkPDF 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_off0000ae08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE08 10516 bytes
SHA-256: 1d93324e3c3a3a5e741e9b946aaecd608b303c50b0e8e2890da1dc42e06cdf11
font_01_sfnt_off0000c5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FF 14648 bytes
SHA-256: dbfe30752c015922266826b0b0c93743d577d1325cfeea219acddc8315740870
font_02_sfnt_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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