Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbf56d6ad05b9bd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 00:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d2047c6e47efceac789fad660e71f7e SHA-1: f16a61cc053f7ef042aa706adda370f843ac6de5 SHA-256: 3cbf56d6ad05b9bd06269a7c1eb29ab1604b873f0383da513da5a37e1f51a238
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://catamma.ru/uplcv?utm_term=c%23+style+guide PDF link annotation
    • http://espicycooking.com/files/file///viwunigajizaxexemu.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/26065971786.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kojuxofasiwexudapenoxa.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161334c2dc2d28---fexokebelufegototupave.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/63611762463.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/4734028650.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/lumowigolupu.pdfIn PDF document text
    • http://hidropro.hu/upload/67520131312.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16130da04c8706---98350020161.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/orovew.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/7927138212.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/52214558805.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/feluvijutasotosexamosem.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/dawunuxafurawibu.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/silekuxosuxilajobalomadak.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aef7089d0---xitegakodopajavud.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/61472714566.pdfIn PDF document text
    • https://latework.cz/soubory/bosibojefatidamidefusox.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vanowowunepovenox.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210914_6B93583646CE5946.pdfIn PDF document text
    • https://masukpt2.com/contents/files/70108443226.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/jojubarezegabapadukoxel.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/89309966239.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/dulafarizi.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_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 18268 bytes
SHA-256: cf61486e1c657d59bab1776f06a33aebb88ece291c651167db58762412c4d5e6
font_02_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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