Malicious PDF — malware analysis report

Static analysis result for SHA-256 944582a4118bc6e8…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 11:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de5cf2c075178a93f7e46c8a9a95661e SHA-1: ffd6dd4e520ddfa137757924261b85215790ebce SHA-256: 944582a4118bc6e858b3b0eb73e5aba8a16c875a4ef28fcb20c5973c23935706
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, with one specifically pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=filmora+go+no+watermark PDF link annotation
    • http://betheaskssd.com/flash/betheaskssd.com/file/15675668491.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf3e7e6158---89608559707.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/jixewugoviluwudur.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/42819993620.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/zemuxepobad.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/28963067352.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/jofabalaxutozafodefa.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/tazevimekuli.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/28356534955.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/85036778910.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/31dc893b060f0c3d7c7f05d7e19b59fc/xuxexalarebepi.pdfIn PDF document text
    • http://sbkf.org/files/files/demiwo.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/metes.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/8185197847.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/39541580313.pdfIn PDF document text
    • https://avflash.nl/upload/files/28016071139.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/viwebimitezerajixu.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/19851285433.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1053294920613f9e3d583a3.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/34362777513.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/nuzinavadelikekunasubu.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/tupofiwalu.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/tugisigaju.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/wufojufaxutefagage.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_off0000d09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 10436 bytes
SHA-256: 79c3c9201f27e5b38ba6df587b5bbc876bf976dc4925aacdeed58cbe4bc583a1
font_02_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 17924 bytes
SHA-256: 694c0215d449cd3904f3be7242d9794f7bcdceba824cc82d0900f0d03466d05b

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