Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d673aae2791e2f1…

MALICIOUS

PDF

80.3 KB Created: 2021-10-15 03:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1eefa2b1ee9afa2a087d916a8597d314 SHA-1: 3a70ebd363da6c3f3cefc3e9641b8837713cbd2d SHA-256: 6d673aae2791e2f1d8a6b6f4ab01332f8d17343e2094a14c83cc794a7b523c51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sonhanint.com/uploadpic/sun/files/202110100214449240.pdf In PDF document text
    • http://encino.kopanramen.com/uploads/files/24510028841.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/8435960610.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/mopepudur.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/gizegamuzivo.pdfIn PDF document text
    • https://ntc-container.com/upload/files/86974287912.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/luzapabozosagaw.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/71042306527.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/fuvozijajoseza.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/82606439933.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/ruriposimupek.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/54763450206.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/24461673090.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/gupudigataputoxomuli.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/jawesixukemagifekazopuw.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/34312745335.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/55235690466.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/16448504690.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/tutokidaged.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090415272633.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/safuxagofexafok.pdfIn PDF document text
    • https://motecx.com/images/file/fugatomidoxapulovejurimit.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/12889523611.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/71581055059.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=gladys+knight+and+barry+hankersonPDF 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_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 17520 bytes
SHA-256: d43d63c5939afa400c1fe3233cedb251b74e3752b896e023aa83e491930e5729
font_02_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 10912 bytes
SHA-256: fbdf0ed639ec05d4d2c65f5b8366245f40e1cdf134eee6c9231eb99cf0759d02

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