Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3721b9e38d7028…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 08:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c86c92ed740f41ef0d2ac5cb5d4bb76 SHA-1: 7e6d13cb3ae05e3afc272fcba5fd0b88f23c2f4d SHA-256: ae3721b9e38d702823c06b21b39ae1f58b304eb6ee130d878b7f2baf4150ea7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://newbusan.net/FileData/ckfinder/files/20210902_AE718583F10FACA7.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df80f30d4d---wivurimoxup.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/sopurumewirix.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/dotesirorure.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/dusowokebiwomibu.pdfIn PDF document text
    • http://taociren.com/upload/file/210915171642828126zzsghopdgp5t.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/fekosuzumurazarus.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/84897356614.pdfIn PDF document text
    • https://ckmandarin.com/uploads/nomaw.pdfIn PDF document text
    • http://okazionche.com/files/1269309898.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/32563031283.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/71653584870.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/25655352284.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/30008967673.pdfIn PDF document text
    • http://megalaserasia.com/upload///tujizotezuxen.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/vipaxuxotikogutiz.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/47525526448.pdfIn PDF document text
    • http://01host.ru/userfiles/files/29903740767.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/dodibe.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/wavup.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/kubamituwozagifu.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/17281479781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=como+baixar+emulador+de+ps2+no+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_off0000b863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 16168 bytes
SHA-256: 54a8c09eb391efd451f54efb915ff352eeecff9984c34e1b994808aec44facee
font_02_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 10948 bytes
SHA-256: ddf08054cef7c0d5c91a66ff14a4017123ddd5dd8609b0eae5fee64d73f038a5

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