Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd5d418ce1eae84…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 17:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fb02fbd5c1704b68e42623ab33a2620 SHA-1: c4c85301d677d1ff2d556aad9713b14e32f44257 SHA-256: 7bd5d418ce1eae84aa13be29f1603bd4bc0ef5f8b743e0d808819aa4be6cc0ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of embedded URLs suggests the document's primary function is to facilitate access to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=android+6+apk+download PDF link annotation
    • http://laxycoffee.com/upload/files/31237396688.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/rowakobapalunixuzudaxabo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f920946c18---15015511962.pdfIn PDF document text
    • http://shopabrang.com/images/files/77741568248.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/18492816135.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-14/20210914145211165997.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/visunurumexigoduwup.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/fuduxepata.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/jovarazubakar.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/43821876714.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/zuzovo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0009d6b4---11783124671.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/jerak.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/56351233139.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/87837815040.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/89930235567.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/19054133770.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/37400394896.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/348690016131269c04391.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jopuvexunopinuferu.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/jefasezubaribokenanisa.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/91618583955.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/040146125835.pdfIn PDF document text
    • http://khamranghaiphong.com/upload/files/54135169481.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/nebibabejibaxewozikegila.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xavipenutugezikesudam.pdfIn PDF document text
    • https://kaimano.it/file/butipakigirewowezu.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_off0000b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 10316 bytes
SHA-256: 9cf81b8e0ed2ea0997892f7793219d6f4a7e68824eb8ba8c1a517fce8c5ccb43
font_02_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 14692 bytes
SHA-256: d840fb9630206748d47fb566022ff6014880ad88df0a5ce3f2613c0139238bce