Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0b6c482be26e61…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 23:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fdd6515a40b822ac23c153d4c15aee96 SHA-1: 4f34707d3aa7c1b8ffa6b6043b5d7fb90574e83c SHA-256: 6d0b6c482be26e610e3c3b9d5788458c066c71c6e4d71bcc8c9f8f16777d9d0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the heuristics and the presence of many external links suggest it may attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://bibliotekaszamocin.pl/img/upload/files/83129363302.pdf In PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/fanifizakirawunupabuxon.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/masobesu.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/93667922072.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/benunubol.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/naragiwatosawoxe.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/60143951933.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630696286bAmK.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/94451061202.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/gosokoxoxezigimapofu.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/zosikutajojerelum.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9637e4e72129a6252bf674fa2cb36e93/68342091393.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/54529031985.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/27374405356.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/78434701678.pdfIn PDF document text
    • http://scsychem.com/upload/files/joxanotofukixigo.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/17130605799.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/61392620167.pdfIn PDF document text
    • https://maymac.info/userfiles/file/14037556845.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/kujovap.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091401153873499.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/59727984280.pdfIn PDF document text
    • https://ever-progress.com/upload/files/pabekisovowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=true+detective+season+1+episode+2+scriptPDF link annotation
    • 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_off0000b2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F9 17732 bytes
SHA-256: e78a653aa7a0e8f25f8f9e73c4798b7aa1e88be6c299b93b1d75189bf0c2c488
font_01_sfnt_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 10764 bytes
SHA-256: 96f1de34cf79d15e953cc1bbe78fe8ae0993e6710b31db2e21d2af4a12890f55
font_02_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.