Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f6c9dde65007f5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 02:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fae4c2d6d7ed0f0bbeaf72f6b59138d7 SHA-1: b6a744beabbf55bd200c30d694917ab4d8401dee SHA-256: e5f6c9dde65007f5cf3f4d5ca40898f96e96521af73022abd413777a9dcfb0ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to external domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=old+testament+pseudepigrapha+vol+2+pdf PDF link annotation
    • http://assessmentinsight.com/ckfinder/userfiles/files/lemir.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/buzojitoragokodidut.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/vatefiriwelerudesidefel.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/woxelinibabizofine.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/16445896136.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/sulosumidifomijud.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/nesakanozusinuruji.pdfIn PDF document text
    • https://fivetc.net/uploads/files/65109976770.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/99037934558.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/deripiwalov.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/66649836657.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/jazixodive.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/73977337631.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/57189643370.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1e2bdaa0---joseluduwu.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/85836331596.pdfIn PDF document text
    • http://peoplefoster.com/pliki/12266689098.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/16202272068.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/249015838.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/25408657390.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/2682509505.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/94825072177.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/duvisiregufudog.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/medoximepepufasividux.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_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 11256 bytes
SHA-256: e6418f23daf38b71b3df3bbe6347f36a616c1601dccb7fd86d6625001079379b
font_01_sfnt_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 17140 bytes
SHA-256: eef0fa5c6dd18df6231160afdce79d8d35821046a8474d68491ca41976f18525
font_02_sfnt_off000119af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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