Malicious PDF — malware analysis report

Static analysis result for SHA-256 44038e9e0741f03d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 08:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 13acec6d78c61f02c6e2ae6ed986c25e SHA-1: 9ad1de38e957bce79d26f763e454d589ef3eac1a SHA-256: 44038e9e0741f03dfd02ec0184ff90d3d5f9e9dfa19f3c36eb44334d285bd295
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests it may be used to exploit PDF vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=watch+walking+dead+season+10+online+for+free PDF link annotation
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/tikutuwo.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/tuseminojuduwalimufa.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/nexisawe.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/pogefaxoxalumove.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b92f199824---36835325425.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/jufos.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/pabakekoge.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/lowuri.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/jopafugazuniganogera.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/35398383240.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/teregolamafeta.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/30835877036.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/poxevurizezuzovabajem.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/wagebux.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/bodolo.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/57132541565.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/10482684951.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/8158621144.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/fopusajoponawejeludemi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161307b9dca3fd---jotiraxud.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/gikubuxeruvufeloxovoluvo.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/11387868385.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/lawogubotenisu.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/5330253812.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_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 17216 bytes
SHA-256: 62a2a5c1ffedbef12fa36aafbb5644265da3b9463c365eed70a84592268fd314
font_01_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 11100 bytes
SHA-256: 94a083647f9c9061a9b0827679a7dc884f0bce02b682970d84b351065fabccf7
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1