Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe260bc7607f61e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-15 16:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30f1c06484a24bb3e904f8625fe4755b SHA-1: 3fcb8645d36528138310c4597e42638478dcdb24 SHA-256: 1fe260bc7607f61e339c92d24df3ff4fb87c70f8cb5ddb8946c92a8f06269781
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ClamAV and an ML classifier as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links to potentially disposable domains, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=notification+not+working+on+android PDF link annotation
    • https://shirbandifelt.com/userfiles/file/todud.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/zefudenorivizajirame.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced544c58e---46761349337.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/69328268772.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/26994660926.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/28066178515.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/lipifatofaxote.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/munaxi.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/sujululeganiwovoneroje.pdfIn PDF document text
    • http://centronegozi.com/public/27155886998.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/83186593432.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/gunuxegiluwesekulojo.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/53263278483.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131081adead9---mirajozeluwizi.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/74349418939.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/junukejemukoseronazosufak.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/39591707237.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/8357520810.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/66067711919.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/77207970440.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/luzagopamataxosokuzope.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/falojumekel.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/bedarifob.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/lodasopuwen.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_off0000b271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB271 10460 bytes
SHA-256: 43cbd01498da3ca3c00601f1ce3a31a378f0b2fc5aaa80f1e8331f4378fd26be
font_01_sfnt_off0000ca32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 15604 bytes
SHA-256: 9892be8deec37f58ac14e4c6fbf14d754414b1f86a61b94931f9997501993d55