Malicious PDF — malware analysis report

Static analysis result for SHA-256 4487581a501e36a1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 21:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 68eb9ee4372f6f9d7878d98b1bd7d317 SHA-1: b027da91f75935998eb8f84b8ddca151348a3479 SHA-256: 4487581a501e36a195eb6ac8448cc225e5c157e906f7cacb85d5ab4c8ee07b23
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://controlsystemco.com/cache/fck_files/file/bidimagagojoxepitowasimip.pdf In PDF document text
    • http://myslizdrave.com/soubory/wokoniwosed.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/76008477857.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/35895731219.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/dinujagekejanivonotes.pdfIn PDF document text
    • http://home-plast.ru/foto/files/96779615593.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/43688133872.pdfIn PDF document text
    • http://hbaoge.com/upload/files/linelilorikefu.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/puvunikovoguke.pdfIn PDF document text
    • http://sro52.ru/uploads/files/jupumo.pdfIn PDF document text
    • http://asja.ua/userfiles/file/sekezikavokuzefunoz.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/japebanev.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/36340799588.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/vewage.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/bizitufibobivutal.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/52128416846.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/xeguxubak.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/esoliku.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/dudewugoduvoxubinanavujep.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/8432716251.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/gevudodazibadezulobixux.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/salikaxowigagesomemowu.pdfIn PDF document text
    • https://cian.hr/userfiles/file/20372131471.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/lotolezobogekagogux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=play+store+password+openPDF 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_off0000c128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 18268 bytes
SHA-256: 6fe29f70d9945ac5be43c74148da2639b6304f3356028d5ac2ca10782b58702e
font_02_sfnt_off00010846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 10492 bytes
SHA-256: c9e241321e2d5ce4c654ca88d97ae20707c3b385f5d71e268843452e39d2edbd

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