Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15ba047fa7d5a6b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 07:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ad3934075d0b6e24f7d4a43e514621f SHA-1: 5a0b259b5209964d42ba86463bb1eb93a52ea894 SHA-256: a15ba047fa7d5a6b97c05d38d4c505f2bde8d939253fc7e2bd6b564e6941ea5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=house+of+cards+1990+watch+online PDF link annotation
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/00a81d8398f5787e458341c8441cb7ba/28512942148.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/78831910919.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/29249789660.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090600304285.pdfIn PDF document text
    • https://kham.vn/userfiles/file/dibanowexafopipisi.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/33338862899.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/34116359682.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/62072897742.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/zubobofolonirij.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9514cb59---puzuvawodidurimumaripat.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210910011154.pdfIn PDF document text
    • https://funke.be/data/file/37068709899.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/65698265143.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/26257753833.pdfIn PDF document text
    • http://gazetavk.ru/img/file/47532334667.pdfIn PDF document text
    • http://tochuchoinghi.org/files/xakibilakewiripe.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/17522347880.pdfIn PDF document text
    • http://santeh.md/img/files/xosemopasubux.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/13587443739.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/19106839765.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/91790422021.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/77018527355.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_off0000d892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 11092 bytes
SHA-256: 5153ead6c80aca05cd672e0cde0d03ae7a2bc905fdf6301da5e6d6758975d049
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 18412 bytes
SHA-256: 4b30b9eb736ea3fceb31575eec868d951bd619efe9a57907afe07c80e0cce069
font_02_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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