Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb627cdcb800543…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 06:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 144ac96d05398896f5cceb4e4e2a566b SHA-1: 969a2a04abbdec54ae28e2d781d8ed4711e6dfe6 SHA-256: bfb627cdcb80054337e9adc9839c1672c9abd208c74d65cb2c31f3caa7317a51
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document's content, indicated by the 'SE_SECRET_RECOVERY_LURE' heuristic, attempts to trick the user into revealing sensitive recovery secrets or private keys. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to download further malicious content, likely exploiting a client execution vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tsradviseurs.nl/mailing/images/photo/file/43981455980.pdf In PDF document text
    • https://bodegoncriollo.com/userfiles/file/19358960926.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/lokobenizezadijifunu.pdfIn PDF document text
    • https://petala.gr/userfiles/file/fegurove.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/xejapitujixul.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8ed563e0---zusababekibesuwosekef.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/55298963772.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/fobomosijozisi.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/25590735562.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/3852481035.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/tenigifog.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161334e2ebe17f---wixeranoxipigulevuxuxezaw.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/52737531546.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/7471688404.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37692982911.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/gasebatakoxazirutepo.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/83760438383.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210905142421.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/wuturoduxelakemakunogigo.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/64375656702.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/fuvusozojak.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/89963860177.pdfIn PDF document text
    • http://erpos.sk/data/files/gapum.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161323dcb97f16---radevarunisutazik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=vk+ohri+microeconomics+class+11+pdf+downloadPDF 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_off0000c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 10988 bytes
SHA-256: 4e4e0ce98ae635b7228cb809574b1631dddc1513c70e7a28461062786ffc77e2
font_02_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 18116 bytes
SHA-256: f621f55d27ef94cd9c392eadcb9035fab369c5d9f9ec9447bf9255e187d48050

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