Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bc56b02fce25eb…

MALICIOUS

PDF

94.8 KB Created: 2021-09-14 04:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b160cf81faed060bb254898caedf6ff0 SHA-1: 0e17636b009da1c1a5f818a955dab12e33d9a1dd SHA-256: a4bc56b02fce25ebb8c5d2f6bb3eecdfa31a31f0747bc0cd71f8303cde909e8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, and is described as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious or SEO-manipulating content, potentially as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://orgue-chantepie.info/FCKeditor/upload/file/99629709061.pdf In PDF document text
    • https://rafaela-motores.com/userfiles/file/74152766618.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613688c49f4c7---77348826970.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/mutenunow.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/25410841628.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/rurepasatovetomusivi.pdfIn PDF document text
    • http://thevalleytrader.com/files/15704432264.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/tixilerotijulagikusidamet.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/nodurosopebevibis.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/vufulivosopivijinufivewu.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/52408945852.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/sunajufutem.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914020157842875.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/96633606050.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/72118760647.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/98509053115.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/gaxegoxinetaferado.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/20925208133.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/lugamed.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/sekijuxilal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+apk+for+instagram+followersPDF 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_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 10932 bytes
SHA-256: 3453568dc219944b3214bb0f941e83bbb6a89efd41dc36ef448ddc0bdbfaf03a
font_01_sfnt_off00012502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 18624 bytes
SHA-256: e1338402421c61d6288103a0853ceb0b644a1015a2b28e3142f7ab080d43ef17
font_02_sfnt_off00015561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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