Malicious PDF — malware analysis report

Static analysis result for SHA-256 172eff7963a84adf…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 21:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f684425914d5fdfd1d5e3de64a646c30 SHA-1: 88163cba089681de669b6e112301deae64cb2608 SHA-256: 172eff7963a84adfeba6b6d878267a052d3a13ae19c2ad065f655dcca71961e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to redirect users to phishing sites or download further malicious payloads.

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://terredellamagnagrecia.com/userfiles/files/79193461374.pdf In PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210906012225.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/02815b1199793260d60ca69adca5cd80/lejisusepikur.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/59949565538.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/27033873290.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/47430829124.pdfIn PDF document text
    • http://atya.eu/files/file/rekitunimagi.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/povunopilakifoguku.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161400fd7ad916---45186443264.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/xulururu.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/64230594336.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/72201167705.pdfIn PDF document text
    • http://normel.org/files/upload/file/60779361343.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/wirukokegunofi.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/83700640309.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/30665834974.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/28903351889.pdfIn PDF document text
    • http://360global.ca/userfiles/file/rimamotamajibexifuv.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/82155180463.pdfIn PDF document text
    • http://373113.linker.tw/files/sunuxi.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/6707093862.pdfIn PDF document text
    • http://spakimthi.com/upload/files/fonudu.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/35258553182.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/50113902535.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/rokibusewowajokiwelako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=erwin+kreyszig+advanced+engineering+mathematics+pdf+downloadPDF 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_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 17692 bytes
SHA-256: d686aa0738f363705204b9c87615a9f04da02b6492b00895b48b57ce9872bf00
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 11468 bytes
SHA-256: 2ab8a8c1dbaf764ad1b4b563ff36bd6c1527ecabcde93b235c804474ae9c3309
font_02_sfnt_off0001150e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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