Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bf78310783fa59…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 10:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0448c658b71953340e8d1c0ca5077a2d SHA-1: 771017506a65d7d3644f66a4e774d36c1984c099 SHA-256: 15bf78310783fa593a244793bd2e64d3ddb91eafd78378707ec5c352fbb1f83a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs and is described as a link farm hosted on disposable domains. The PDF structure and embedded URIs suggest an attempt to lure users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://catamma.ru/uplcv?utm_term=female+life+drawing+reference PDF link annotation
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/gakisezosaxedikigunak.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68634eab3---kazeguv.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/55032903911.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/65243240001.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/97917084419.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/tigawofuduxusuzusas.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kobamakeduviboturak.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109032219038212.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/dubajuvodovugojepizefepa.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/lugepijowufaker.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/rorabisudoxikavojiramusip.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/velazidunopebuxekowaji.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/94264295086.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210916035948.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7884f4a85468cd326a98819a7800d703/81372862566.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/tototilapoxukezixeresog.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/lolidilanawasitezatujupoz.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16145243ba8882---xegejoki.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/doropesamomukosu.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/51785850133.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/fufapizedigovorumesib.pdfIn PDF document text
    • http://elitacasa.it/images/file/37676540289.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/nizalad.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/pojamepe.pdfIn PDF document text
    • 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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 10496 bytes
SHA-256: 379df9be4c4c8e053eab112b3aa0e08a17610417a0e1f97a0a6d0189a463a1ad
font_02_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 18144 bytes
SHA-256: 59d7f3e9b7b76355a74aaf85c227abd37084d21e4632ba4f2ada6aa26c54c4b0

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