Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de81b9276e94e26…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 13:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98edd8858a5b16eb7f3374d7a92fe8d2 SHA-1: 21298fd9501b96c87e35efcad890ec2ff7216856 SHA-256: 6de81b9276e94e26127afbe846987fea6b1d7d284d90e8ae9037081b58c6c037
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious PDF files on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious links across many low-reputation hosts. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://houstoncoinclub.org/FCKeditor/file/lopapodaxita.pdf In PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/suwawosomu.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/tamogogetixokabegozo.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/25099097519.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/vakig.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/purozonoredi.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/fusot.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/89882812510.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/84204710413.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/giwasi.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/78884833018.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613436281e0c1---topidebinudav.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/72286805829.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/07/84540626947.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/8948122948.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/14724166247.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/13561848881.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/senerakovegivomokutufo.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/51128159204.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/81710983245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=router+control+app+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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 17944 bytes
SHA-256: 33225984f8eaacd08e0d00eee113a9e4de545abd2dd4d21e43cd3b03a1b75752
font_01_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 10484 bytes
SHA-256: 808abfffb0ca8edac707e2afcf36d96a094c4aacdc356caadf500b489beea5be

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