Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4230aeb12d32e6d…

MALICIOUS

PDF

63.0 KB Created: 2021-09-29 07:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 220f7bb1e67f5008acb44dc1127d8fc1 SHA-1: e66c2507ec22c0551f7b6536d31a8a6ec9d0135a SHA-256: b4230aeb12d32e6d16f2a6342e305e97df0bfe211354847a19dc6de9a827e4d3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5809

Heuristics 4

  • 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
  • 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://serviceservice.eu/userfiles/file/sinowozugesijeruwomudoxu.pdf In PDF document text
    • http://pmrs.ps/userfiles/file/13583341645.pdfIn PDF document text
    • http://dogable.de/userfiles/file/76064144641.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/dekederakigerudesexipawi.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/potivanilagixug.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/gubozan.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/5149677846.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/87710358088.pdfIn PDF document text
    • http://iknow.pl/files/file/75201929144.pdfIn PDF document text
    • https://mimpishio.com/contents/files/36321447704.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/45556070328.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb24c85448---51530358273.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/4510516407.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/vonorisozelefiwimapedonaz.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/47568211974.pdfIn PDF document text
    • http://ativn.com/upload/file/zesizido.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/26532078237.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/detujuzusunuxefezalewedi.pdfIn PDF document text
    • https://anaksemut.com/contents/files/5065830533.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/28475384256.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/570313505.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/67243618473.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/20523801141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=video+slow+motion+karne+wala+appPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB490 10700 bytes
SHA-256: 868fe9b0b6deab603427770271ec4c999384dce7efe464caf4e581749f67ed11
font_01_sfnt_off0000cd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD20 16828 bytes
SHA-256: 5deeb0cd7ec9c1f00054f5d36546057ac1b470ee38aee397431f285c87e2ba32

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