Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd91833c4ce7f12d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 07:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 457fdd26b63c02b3a21addcc7bf82ad4 SHA-1: dfdc9f6f51cbd2e2ee19361981ceb2152f2bbf09 SHA-256: bd91833c4ce7f12d60a473354cba28e201c9456b1af97b10b14006a152c43fbd
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.almansori-ye.com/almansorifiles/files/63393744801.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4dpalr2dob881hqlhnaeq3ucik/12046619945.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/puwowogi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145658030ce3---duzesotalan.pdfIn PDF document text
    • http://roocenter.ru/upload/file/jozofuburexanarurase.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/lijurovusalowalivurujop.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kivovutugofaxiwetuzoni.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/watikisifasutapaxugexivum.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/79384662958.pdfIn PDF document text
    • http://temple.mo/userfiles/file/1154954346.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/5139977051.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/xaxakipolozanax.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/11961741924.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/69516736822.pdfIn PDF document text
    • http://yjccnc.com/upload/files/40904203837.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/65576214093.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/wilovunusumakir.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/59821808927.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210906_87D13D7689366C0E.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/takiluvipusubeboxebusa.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/78185165347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nikki+rosa+poem+themePDF 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_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 10436 bytes
SHA-256: 400b23d1e496dbc44345971216fd9743b67f84fbdf35e08e51ec754095d6c289
font_01_sfnt_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 17920 bytes
SHA-256: 39bc5a3b71022cac5ed456426d09d9eb7ab62cc7348f8b6f5b998ba7745ab5a4

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