Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74bbd0673a348df…

MALICIOUS

PDF

105.4 KB Created: 2021-10-23 14:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7469089c6e53b2b803762ddc3627bb0 SHA-1: 78c45639e59628834a338bb45cc97dc96c08e4d0 SHA-256: b74bbd0673a348df5155041cce7a53ab471a67b6941c58b6843e0f509a7a067e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains numerous external URIs pointing to various PDF files hosted on different domains, many of which appear to be disposable or low-reputation. The PDF structure and embedded URLs suggest an attempt to lure users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6685

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cructi.ru/uplcv?utm_term=office+administration+manual+pdf PDF link annotation
    • http://danies.ru/ckfinder/userfiles/files/67795222418.pdfIn PDF document text
    • http://rsst77.ru/upload/files/42359795062.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/49d6a242122a8a2a8ce6f558a8ca62ee/xeporun.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/76184008499.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96813461568.pdfIn PDF document text
    • https://remini.hu/userfiles/file/61577370333.pdfIn PDF document text
    • http://stylekd.ru/files/zamujomusex.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/xopexabaxoloxezow.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/kakewakuri.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/93436320965.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/7906902080.pdfIn PDF document text
    • https://brs.jo/userfiles/files/2703499908.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/polugemalaxuzafowalojiwe.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/vovabedilonotojuja.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/wikisoxapiwimoziz.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630808122_1.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/81486900363.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/98411332007.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/rasazoxobuwupijuvi.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/roxazer.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/gurirebum.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/rinijorumajajoko.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/nirukavi.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1616371a263b3c---50970976293.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/tadomukolesofulo.pdfIn 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_off00013e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E01 10908 bytes
SHA-256: 5791d8306de0b1905660ba35ac1c797c29c6b4ec49304862d2a9c4b9f26bac41
font_01_sfnt_off00015736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15736 19860 bytes
SHA-256: 302bcceac2efc076cd341b9e9b8fad752a9b80cd11af36424ccde3b90c12b8dc
font_02_sfnt_off00018b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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