Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ce541901682012…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 21:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b7b1aaa8668277b803a97aee93f906c SHA-1: d69423f5b926b21a806b6ad53853bee624809a8f SHA-256: f5ce541901682012d4324a62f6cbe548d75919d8ca86ae9f1375bd2816d18cbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, suggests a link farm designed to redirect users to potentially malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=android+cast+full+screen PDF link annotation
    • http://congseng.com/uploadfile/files/vedidulugelogumali.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/wijebugafobutofagiv.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/jatororisawam.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/70378591536.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/rogatoromunuba.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gezubakuwonoxenodib.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ba7456fca022061570a8631c45646f90/dumovojonemiwomu.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/pegujumejan.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/lesutafirefojeruxe.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/76733775430.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/23028357752.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/wamapefe.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/jinugomumusuwilotow.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/48106763189.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/demukiwefe.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/90581312486.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/34935665779.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/tikadob.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/siwojo.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210921020752.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/fexesuvemewavago.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/lubudesokasuzagaz.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/senexerowaxajek.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_off0000ae10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 10552 bytes
SHA-256: 76352d95022113c988d76e18e990e26064542b67eb841e952ced751145f2078e
font_01_sfnt_off0000c643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC643 15192 bytes
SHA-256: e9acf9cf2d89a1a830559fd30f7653f968e7f0891c43f4d9abf29d4c34577e46
font_02_sfnt_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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