Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3cb155f2c63b00…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 11:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1fc9030c7ef343d2cfc47cff370dedf SHA-1: 105e3bccb5659fccfb0e108133b191c7e5dd1764 SHA-256: 5d3cb155f2c63b008555b8921b61c1705f8d9a33d029db4d404dbf4be505dc31
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://houstoncoinshow.org/FCKeditor/file/kolelivojusi.pdf In PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/xukolatujirun.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/detisaxijebires.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/24459456477.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/44162524403.pdfIn PDF document text
    • http://artdental.hu/editor_up/9697296842.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/gijadosukojujo.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/76943891325.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210909185137.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/fupakeza.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/72437805467.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/420bfe74349d5927163075ce4a7cea14/63720652796.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-16-21-29-01-24.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/12123973953.pdfIn PDF document text
    • http://ailizia.com/userfiles/43468363564.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/39676671247.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/zokejugarej.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/70696521825.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b83f35dff2---soropu.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/69587720513.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/tesolumumidivid.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/52876842166.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/patasimibu.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/52439018322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+know+if+there%27s+spyware+on+your+phonePDF link annotation
    • 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_off0000b69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69F 15576 bytes
SHA-256: dea4887b033ac15e56418e76bf60dcd1280ed8ad8b700f095ae7a2e43bfe1ae6
font_01_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 10968 bytes
SHA-256: bae359ed88086af406e156a970061bffac5cf4db34ade3b630f8eaab192af1fb

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