Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e78bb7ff179d5e1…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 09:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd09de6e8235ada74d52528f05708006 SHA-1: 2542d2fee736656ff1fa7db8f7302bd4e162582e SHA-256: 8e78bb7ff179d5e1a596ddcd6127301b87d0659d3b15b728de96d53dada5ccb6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF's structure and the presence of JavaScript point towards an attack pattern involving phishing or malware distribution via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=best+offline+and+online+games+for+android PDF link annotation
    • https://mujeresenmovimientoplus.com/userfiles/file/38856308711.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/43384918710.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210909_011702.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210920085638.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/tidowuxewaz.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/83804285592.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/veruwawesevezebu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161354e5e78455---zozubudefoxa.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/37571852312.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/74971850762.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/72017236541.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/kotabagizi.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/68513833222.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/88533983716.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/patuxikuwadadusodafo.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109151644513815.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/30951405716.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/91814001622.pdfIn PDF document text
    • http://cl-pub.com/files/files/pofumofize.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/29684809173.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_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 17268 bytes
SHA-256: 06c75ddc419f3631a8c99f9715595fea513c6fa2c259b5f5f084e9ebe7839f84
font_02_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 10752 bytes
SHA-256: acd045af8552cf419835543dea48ab1029d84bbca6726db1256776ef74b93ab0

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