Malicious PDF — malware analysis report

Static analysis result for SHA-256 741401d46d0aaa35…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 23:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 85ae17684f3a6041d5a4a37660498878 SHA-1: d889b8ac93ca17a7ddc5a2f904a8e4c15a96613d SHA-256: 741401d46d0aaa35b640175c20a48ea26166656bc6acaa8a805a40b81dd7322e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are 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 for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baugeraeteverleih.de/benutzerdateien/45746624265.pdf In PDF document text
    • http://clubselectionvoyages.com/images/file/dagedubinukike.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/15672568665.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/2512559203.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/baxefalur.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/xuwuxafubelutabobufasebi.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/rejipador.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/19821877030.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/50139894213.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/luxifex.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/modoluwifafo.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/26975180914.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631217586.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/bodebakevak.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/kufos.pdfIn PDF document text
    • https://deepex.hu/hirek/files/7245295431.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/60859917234.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/bogufurarimoxewaj.pdfIn PDF document text
    • http://tochuchoinghi.org/files/ziposi.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/fofipipuduweb.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/dafubapiketerozujud.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/31006907555.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/gapuzaximixeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+recover+deleted+messages+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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 10856 bytes
SHA-256: 8ca637f7b6d2570f3cf24b646dbc133c38794e3958e14626be11d9479b913407
font_01_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 18844 bytes
SHA-256: 3ac3ab3843b969d42db5830d8c202fa7f99903bd46be69d132c8b5523c71d358
font_02_sfnt_off000130e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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