Malicious PDF — malware analysis report

Static analysis result for SHA-256 5289919ca82af68a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 07:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5908d7010bea9a4c6c67030ec4208912 SHA-1: 8558d93fd074ff397d638dec09ba6dc70e249c94 SHA-256: 5289919ca82af68a34c8d0d8ce1a02f08321104799fa16efac52649daa6ceef0
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. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=stuck+in+dfu+mode PDF link annotation
    • http://files.ibiza-ferien.de/file/31701803398.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/69829220861.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/lumabuzaxaruv.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/pewanadafa.pdfIn PDF document text
    • https://ags-car.com/upload/files/kipagixafadugeli.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/38667622962.pdfIn PDF document text
    • http://rotang.net/userfiles/file/zolebopaxolubipow.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/8621247440.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/76556848787.pdfIn PDF document text
    • http://e-district.org/userfiles/file/fitelaferukex.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/gonegobilekajinivizo.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/zugasamawimobumakigofuzos.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/92381455469.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/2188879467.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/a73ef7749f04a2974c22ead2cecfa908.pdfIn PDF document text
    • http://symbolfoods.com/files/file///xekevowabomezuragegigom.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/52303493366.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/vopijemova.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/49473246069.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/97083798792.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/87124088187.pdfIn PDF document text
    • http://bluebossa.pl/files/file/52422345838.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lukovojokupulasux.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/zolupunodunabuxevogalo.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_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 10428 bytes
SHA-256: c13176ef725d73762745e720c99d2d3afc71ff6233bf1544835b46d3e788c328
font_02_sfnt_off000106f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 17360 bytes
SHA-256: b600b1a9438b87c7b22dbad9df714e89b90a758a0078d9c3de0269a50ff89e63

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