Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0064ad54a3a347…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 19:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a5459a9dea8c89e7c008cbce7b0bf16 SHA-1: b13f0ef4288f0723baaca981ba9d174db6e8da44 SHA-256: 8d0064ad54a3a34792fd75e6ec497cc67c55703ac43a5340c927b4ee299536f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to potentially malicious domains, suggesting a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ferrocom-spb.ru/userfiles/files/54719999993.pdf In PDF document text
    • http://al-bandak.com/userfiles/file/dojekove.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202196059122711.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/dijixojaxakisofabel.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/78013520368.pdfIn PDF document text
    • http://telektrans.hu/editor_up/zejofenezoziserujimosa.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/58445236151.pdfIn PDF document text
    • http://intertravel.hu/_user/file/903058458.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/2031430863.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/lokovubomafitigederal.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/26446161688.pdfIn PDF document text
    • http://xsjprinter.com/d/files/sesefarajopefixitujusim.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/74507685156.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/lasusotem.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/lopixezojakiduxam.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f6e553933502b846e9d693a762a3ae03/tuvobunifoxuramogutaki.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca7aa913d---duworusurubug.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/52270685761.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/memedipukiwegijulewupap.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/mepepofinematisabevomeluz.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bffa0031---bifizuziregedipis.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/51828222149.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/xewek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=latest+pdf+of+ielts+speakingPDF 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_off0000b93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93B 10624 bytes
SHA-256: f8c6741ac8766ebccca60e527736c479dd5694ad35d257287a3dbb6c15f74fa2
font_01_sfnt_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 15544 bytes
SHA-256: 36e4bb7cebb3f8a89e60f07a7b2a114ce1a541c4fc9fb04491c62ca6f60b499f

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