Malicious PDF — malware analysis report

Static analysis result for SHA-256 586e22b553e07722…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 16:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c3a95487f85fe355690ff0cb8ccf785c SHA-1: 7f07c4f76162f478af40246619bb7f0d7df29870 SHA-256: 586e22b553e077228e4d83f68acd18130f104e573af3a3a2119106ae5142707a
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 embedded URLs pointing to various domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=how+to+send+picture+iphone+to+android PDF link annotation
    • http://rm-centr.ru/uploads/file/jirejuw.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/86100738702.pdfIn PDF document text
    • http://rakuteriyakicanogapark.com/uploads/files/tuligud.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/76577124856.pdfIn PDF document text
    • https://stauber.lt/images/files/wivusaxenezijubogog.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/lugurolojideki.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/73129059535.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/biwit.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/lofubeporojoboluji.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/24591423016.pdfIn PDF document text
    • https://33mobility.net/uploads/files/beluxojixufuke.pdfIn PDF document text
    • http://skisun.it/userfiles/files/45388268763.pdfIn PDF document text
    • http://abworder.com/uploads/files/57673695851.pdfIn PDF document text
    • https://cubic.is/userfiles/file/50984771528.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/83043746030.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/87149751463.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1b1524971f1f5c01038ab047835fc823/22032393137.pdfIn PDF document text
    • http://vasa-project.org/fckupload/file/torunuwope.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/biminorosaxuzarukegedobi.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/dapalatamuridaf.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/22357978461.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/20202102884.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_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 17332 bytes
SHA-256: 7723944215e051aacf26b676c7a366ca06ca5c3dd1cb0a92a1bab96f461478e2
font_01_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 10740 bytes
SHA-256: e81365732feceeffdf76d552a37fdade15f82389ec6956f229d96470e5f1fd90

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