Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd151c22b760be5c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 21:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 645b17e88d33dce24a7408516c7c19ad SHA-1: 5cd55f62c3cc44210c7c7bcda25b383a62a9954b SHA-256: cd151c22b760be5cdb11d0408da2fcd6e75fa299c5186b01ac2f16d8cd3b781b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosting. The presence of embedded URLs suggests an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=midnight+diner+manga+pdf PDF link annotation
    • http://homelife-superstars.com/image/files/68256594031.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/41148744349.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/60818787684.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/zukokumivikupalinej.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/49615407703.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/vabokudidimug.pdfIn PDF document text
    • http://stl-hk.net/userfiles/bixorezu.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/jagulimeluvevivaxubexuje.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/bosuzivalunibiwaronawawop.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/26209409146.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/firotew.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/dexuvat.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/8217119126.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/fojixab.pdfIn PDF document text
    • https://taperagi.com/contents/files/87557598700.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210903043048.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/suviniped.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/rufavesofoxi.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/donibifafesojozixid.pdfIn PDF document text
    • http://clerus.hu/files/file/xupilad.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/15552841116.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/dizafora.pdfIn PDF document text
    • http://i-dron.cz/data/file/26235538617.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a08cf2f5f---tabaxenagunexed.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_off0000beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 10604 bytes
SHA-256: 87b1a25bf21e687e8aad9bdbb9e3542a5bc0eb50bc47b2bd32a3372a27bbd09a
font_01_sfnt_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 17980 bytes
SHA-256: 16f92a9e0cf184c81e47685a3a7e5a3023b04ed40db61621e03612e898963550
font_02_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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