Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9872880e8845e5…

MALICIOUS

PDF

74.6 KB Created: 2021-09-22 09:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65a8ec81cb68898fe5001c209dfa5c4d SHA-1: 95efdab52c5a4ca83047dc5e72f7ef26db30b82a SHA-256: 9b9872880e8845e57eaa424e795132945e2e10f3f8361087959f30c5e70a9f2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. Heuristics indicate these are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=how+do+you+block+a+number+on+motorola+droid PDF link annotation
    • http://fullcolorspandoeken.nl/userfiles/file/kuxibuwibiketelozo.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/nojuvemudim.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/vepupovodunaduweb.pdfIn PDF document text
    • http://standdominica.org/files/files/65490858399.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/dogexiluzidujivoveg.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/wagopapowajegigon.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/98924491304.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kepafatudolomomefosipi.pdfIn PDF document text
    • https://noventa.cz/media/files/file/47760466090.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/35589597131.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/munomofifafilagovuporuro.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/bt0ti2qaju1h74gj6ldi0qsqrs/mumuka.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/3540254949.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/82630020599.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/gofakoxa.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wetonagufiwagoza.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/simazunumulonisud.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ce188d799---bunakujilud.pdfIn PDF document text
    • http://swift-tw.com/lcc/upload/files/tatodevabes.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/kesakesuxogiw.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/gebevijukatanukeludaju.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/43409023213.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/65763430973.pdfIn PDF document text
    • 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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 17668 bytes
SHA-256: 39fd2abf636151ab3dbd8cf1a4e6b113300fc3d8825dc82b1861bc2cd53a9748
font_01_sfnt_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 10884 bytes
SHA-256: 68df1030a1db037ffc45aafc657efbea9ec033ca53bc5f9009035975f8f44526