Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5afe9f8d5cb412f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 17:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bcdd4d1c73d9aec08ae3c0744cbe13a SHA-1: d0bce8656dd3ffd65082c624daba7e9b63ac9c5d SHA-256: f5afe9f8d5cb412f080e6868ea56a99b99956577d80d7ebe9f376016450bcbde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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=how+to+get+someones+ig+password PDF link annotation
    • http://chi-kara.net/Upload/files/wukiwexezejedibi.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/begifizabato.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/66042875284.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9lfcd7prm2d0donnradehp5ihq/morejitu.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/xebunimebupubowuzesivabab.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/bosarasisapu.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/84091029991.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/14915121231.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/57967779077.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/temimisizubazazoriz.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/gogixoladifus.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/29991442814.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/fesotikofafelej.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/99510266899.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/woxewanivadogigura.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/36782459962.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/56004240366.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/77944488281.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/89014787287.pdfIn PDF document text
    • http://aven.su/userfiles/file/runitajarukogoxam.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/ranimanib.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/jexamebefoto.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/josizutukodobozokip.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210905_000153.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/nomut.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/wajobutejijonabisuju.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/zavasixejesasa.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_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 10768 bytes
SHA-256: 65b8a5489ce287e26eeb4828e539bfb538c0f02324fb560729ad01c4b9061faa
font_02_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 18764 bytes
SHA-256: 96c7b9953216225c82be0e66a05d6ae71667230e70e43fa5de8a48077900df09

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