Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead4475a8821e30a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 03:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 889a90b99e82d3e5c0f85f2af23a12c8 SHA-1: 703cfc5ab318bbf69a7c161ecac43e69525ea1b2 SHA-256: ead4475a8821e30a2588c59d4720fd8ee8c242f3b12f91eafb4540283cc3db48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to various domains, many of which are likely disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of numerous links suggests a campaign to redirect users to potentially malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=group+chat+settings+android PDF link annotation
    • http://abwmarlboropike.com/uploads/files/95042455585.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210907033523.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/86512314477.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/kedofumipuxilizepab.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/55290136106.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/zejinizigajepoxaj.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b5176c4f---78935267772.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/12614482851.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/31511842720.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/85798562522.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/5491806161.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/35895357322.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/bidufibopudetekazidogap.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135980711f95---xavinoposi.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/52632448410.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/71970940326.pdfIn PDF document text
    • http://farmina.ru/uploads/files/todozedolezaxedalev.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/59968781002.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/kukodiwovof.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/bazetesonutexum.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/17640335051.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/98977180753.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/nijufovefosozilar.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_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 10884 bytes
SHA-256: 4bc3ffdb98911ead23af3962cac3030be335d13d9b2efc7a266cbc472a3ff66c
font_02_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 17164 bytes
SHA-256: 3038eff46c1b9541c97c88c5d486b35c6c7acf2a8c158e0279e8b34fc74f6d63

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