Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee91c9554d730237…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 05:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93353feb3a7fa2f0ba4278f90b0ab63d SHA-1: d9cdbfbcf187abcd3590af6ca6643d1b1a311563 SHA-256: ee91c9554d73023740321ab0ca4495920f955f24ce1988f8ab8a8e3c89df8ac5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. While no scripts were explicitly extracted, the presence of numerous external links suggests a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=t+adjectives+to+describe+a+person PDF link annotation
    • https://alcoquimicos.com/ckfinder/userfiles/files/talujufadaluwotenolis.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/lujurubi.pdfIn PDF document text
    • http://tabletopad.com/images/file/baripetedupukebofugezotid.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/lizabewopimatedem.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b73fe2f64e9f5316c3cabece5c205bb2/95358376444.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109060257324017.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/niziripomi.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/75425663871.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/lijalubujexe.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/21264712580.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/78428865802.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109020254029714.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/bajanevovibepirexovewebu.pdfIn PDF document text
    • http://midospa.com/upload/files/35524055697.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/wolezibumarosiled.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/68222008103.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/fukulera.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/rolizusizajotonupanef.pdfIn PDF document text
    • https://plasy.com/uploads/file/22409439906.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16132c887d8c40---32512902600.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/sofexelokin.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/zoxovopekemas.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/sagasavoluruze.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/guwobolabufetuton.pdfIn PDF document text
    • http://learningkey.org/userfiles/towax.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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 17412 bytes
SHA-256: dcc18f5127d152249d870ffae2d82135eafde3582a1421e3e55633d10f3cd000
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 10760 bytes
SHA-256: dc986dd5f59080e1738cdb1f2a9160e0176810a64dd55effc2b0ac2f6828eeb2
font_02_sfnt_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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