Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e01021cafa1c639…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 14:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bdbd2809a34d4904759b4a0c5603f713 SHA-1: dbb213d3df2e03e308b175af60476c1da2310562 SHA-256: 4e01021cafa1c639eb1983f45627c17d99bb3fd5b8c2efe3800127d281935e45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm or phishing infrastructure. The PDF structure and heuristic firings indicate it's designed to redirect users, likely to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=things+to+make+in+a+minecraft+city PDF link annotation
    • http://www.alexgis.com/siteuploads/editorimg/file/75427848781.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/tutezukiwuzoduwibunobowo.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/74016907814.pdfIn PDF document text
    • http://sdes.in/uploads/74073423195.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/jaruleb.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/nevoro.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///23641418717.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/sixusenob.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/giwotanoforolazimuda.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/28714879948.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/mudujisumapeno.pdfIn PDF document text
    • http://tradotel-riviera.com/file/1859742657.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109071251163705.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/54878410222.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/liziwel.pdfIn PDF document text
    • https://medtek.vn/storage/file/tufuraxi.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/19095238356.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8458c443df40c4b6d7d0992bbb08222f/pazoloxolukozibiz.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/figudukefufawudol.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/pofuruwugim.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/23881079947.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/rejuzovapijivesatosub.pdfIn PDF document text
    • http://santeh.md/img/files/lowokotaraxivufoga.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/tilif.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_off0000ce6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 16884 bytes
SHA-256: 8578275f35fb1b39ea5b9f283ddee1b0b1769968af6c53d162f59786062c432a
font_02_sfnt_off00011220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 10908 bytes
SHA-256: af44d962579e6100a5c3e8a0a63a7d421b4dfcf86ff0d332bcbe032c768fc6ce

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