Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff227169431ef03…

MALICIOUS

PDF

75.9 KB Created: 2021-03-18 19:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: addec841e39bd03d790caced76628b50 SHA-1: 2b88a9d14ce34b1b2bdfd80da9eb8fa75c7e88fb SHA-256: eff227169431ef0351c7344ff26afb156c7c8eff419ab8df1f330a27cd3d1ec1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a primary malicious URL identified. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Wd my cloud connect with usb', directing users to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=wd+my+cloud+connect+with+usb
    • http://xuxetosufuzo.getenjoyment.net/42260231110.pdf
    • http://zodatowafe.getenjoyment.net/krups_nespresso_coffee_machine_troubleshooting.pdf
    • https://dirarogevuku.weebly.com/uploads/1/3/5/3/135351224/nokoridoger-zuwasenadugaxiv.pdf
    • http://nawemofukewo.medianewsonline.com/17420725642.pdf
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/c47846f678a.pdf
    • https://nosugorowemuz.weebly.com/uploads/1/3/5/3/135327492/wixulukametobot-jitajazusavo.pdf
    • https://woniwisupu.weebly.com/uploads/1/3/4/2/134266019/a193d4982cde.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mexavofezoxi/xazavasaxifo.pdf
    • https://s3.amazonaws.com/vavejijitatofu/chess_application_free.pdf
    • https://s3.amazonaws.com/lomogas/basketball_jersey_template_printable.pdf
    • https://s3.amazonaws.com/xuxifuzituwu/sample_employment_contract_hong_kong.pdf
    • https://uploads.strikinglycdn.com/files/5fc215d5-64b1-4bec-a2f8-f22bf2c4483a/what_does_chi_stand_for_hair_straightener_use.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/wubulof.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/whatsapp_messenger_for_pc_softonic.pdf
    • https://uploads.strikinglycdn.com/files/0bcfa064-cef5-46cd-842b-02f332b8dcfb/99053909052.pdf
    • https://s3.amazonaws.com/wefadep/67858566414.pdf
    • https://uploads.strikinglycdn.com/files/6b576003-03e9-451d-820e-6d17df5afefd/79922940259.pdf
    • https://s3.amazonaws.com/sefabe/bhaiya_tamil_movie_audio_songs.pdf
    • https://s3.amazonaws.com/befafuni/google_account_manager_8._1._0_apkpure.pdf
    • https://uploads.strikinglycdn.com/files/575b825d-c16d-46ae-a3db-537bbc160e8f/harry_potter_quizzes_pottermore.pdf
    • https://uploads.strikinglycdn.com/files/46ec27d6-4b3b-4388-a05f-9928eb97cd7e/24631577107.pdf
    • https://s3.amazonaws.com/fadadedezeker/suwiwifozoxokiwo.pdf
    • http://gupatevefojip.myartsonline.com/vewubenawuniliw.pdf
    • https://s3.amazonaws.com/senodiw/can_you_sail_out_of_the_great_lakes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb46.bin
5fad72398bcdcf4dfa113d39557610d71b42c7c0979407ddd4703aeee5d99535		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 5220 bytes
font_01_sfnt_off0000fd05.bin
c37f3a8f1e5b2f5840fd6a067d7a3e92a32eb9cdf1a2b066d2ca64ed8e150f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 10904 bytes

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