Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad44058dcf85afe…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 14:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e4c3e16379277b84f673aa3fa566f963 SHA-1: cdbc3628ff4102f5879c17d9963fbce57eab187a SHA-256: 7ad44058dcf85afe73b8ecfb0f3a471ee19a3e6380a49b711965ad799bdb3c8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it directs users to phishing or malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=watch+mamma+mia+here+we+go+again+online+free PDF link annotation
    • http://k1a.ru/images/files/file/fumusejafufatod.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/degewakafusoxivolesufe.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/20952421876.pdfIn PDF document text
    • http://sakem.org/userfiles/files/gadagima.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffae76732c---59659241713.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/94917258798.pdfIn PDF document text
    • http://chipgene.com/image/files/20210905_233452.pdfIn PDF document text
    • https://pr-dienst.ch/file/88240191294.pdfIn PDF document text
    • http://fruitsad.pl/images/file/kekikafexobafofiradita.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/xowijuviwipo.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/51468671351.pdfIn PDF document text
    • http://labsshop.com/d/files/4988843449.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc09ef368---97145724456.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/33228662370.pdfIn PDF document text
    • https://matricula.arendic.cl/files/muxexozofow.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/79939625350.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/xowapekimu.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/98188745938.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/labowujuxinazimiwugadunu.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/19562540356.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/tirusibidupakako.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/28582615678.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_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 10692 bytes
SHA-256: 48fbbc152f824aa21dfd83357cd6aae3366e4e29a9684efea2eebdf90027e6ed
font_01_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 18516 bytes
SHA-256: f3018bae7482ee70df26b7948934fc4907d69ef361f8147f54066caf9b2cbcc1
font_02_sfnt_off0001277b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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