Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cac925099f1d7d4…

MALICIOUS

PDF

72.5 KB Created: 2021-09-28 23:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 370f81af60466e9be53a7396f6a28370 SHA-1: 687842c172ea5567a635fff0c3f42be1afbec5ab SHA-256: 2cac925099f1d7d4db91697957ae07d7426ff4dd6e6eaef197b8dd4c2761e64e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://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_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

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