Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df2cc9e93731329…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 23:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78f1f16c1319573a760b10110dcd9f98 SHA-1: 82e8598c18ca1b793bc9b38cc1df19bb9bd6edc1 SHA-256: 8df2cc9e937313299930301a0f351fd2694441a4d51bea83ec50d54ac23bc4e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it's a link farm PDF, embedding numerous URLs pointing to potentially malicious or phishing sites. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=19+days+manga+pdf+download PDF link annotation
    • https://needlugs.com/userfiles/files/40981690192.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/27302221993.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/dupebiduxupexa.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/88825672917.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/74242948361.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/75578082166.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/10333229762.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/76055195738.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/53281250099.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/dupovukirubev.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/refozexe.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/jalajesenipoxab.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161416a77d9e4c---sofafetozinekijuri.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/32235881546.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140789b52db5---rodakotivoxiwutoxatuzagok.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/46269457108.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/8848000720.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/20818343838.pdfIn PDF document text
    • http://halanmilk.com/upload/files/6715333557.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/25156998702.pdfIn PDF document text
    • https://aildf.in/userfiles/file/kisabopavuneda.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/xujosulijoxujan.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/nukibap.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_off0000b2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 10744 bytes
SHA-256: bdcd95c63b315d3cd06be59176ad72aef58fa349191fdc0da9a1dc455eb0ee06
font_02_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 16108 bytes
SHA-256: 528a255c4b8bd1ae6f1f3cb9b751136800e6cf8c5214539d713b7d9d8b9833f2