Malicious PDF — malware analysis report

Static analysis result for SHA-256 902729e750139666…

MALICIOUS

PDF

72.9 KB Created: 2021-09-29 00:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81940773b641f1b6a785d14a39e81bd9 SHA-1: fa83fac59b32a93a4f0de3a969a179ed285d1776 SHA-256: 902729e750139666bee5746a8e16db2bb74c7e7249f64b43b15f0aa69df6b2f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominently featuring a lure for downloading a game file, suggesting a phishing or malware distribution attempt. The presence of multiple disposable hosting links further supports a malicious intent to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://synerhu.ru/uplcv?utm_term=download+gta+5+for+ppsspp+iso+file PDF link annotation
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/35389982699.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e51a55d6---zutere.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1632895324.pdfIn PDF document text
    • http://skupka23.ru/upload/m/94633243404.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/57ea6e56a33910afdff5d89947ae4deb/noketamodebaf.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/rutosisinominikamon.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/zosizedexazojubetum.pdfIn PDF document text
    • http://visoda.lt/ckfinder/userfiles/files/lusolirumupivujuzigivow.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/xelud.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/80446479926.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/dolenekenogitunuriwip.pdfIn PDF document text
    • http://sinostandards.net/upload/files/73680086174.pdfIn PDF document text
    • http://princeverma.in/uploads/files/24395105918.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109082257347761.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210916153626.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/47440888532.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/mugejuvolanamudule.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/77183254900.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/dusekenuxitesuxomubariwi.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210921_120346.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/debazav.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_off0000b66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66C 10896 bytes
SHA-256: 4c649b9b56394ff28f36ad3c63820156288fe9efcaf33cb2b062a3788afb1068
font_01_sfnt_off0000cf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 17884 bytes
SHA-256: f832a8b2196c15431c4168aabc74ad896740b93409518d4d1a7ee549e9c28175
font_02_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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