Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f253eadd1fffbb…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 12:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c82e47dc7a12dd387e6c54f41f244ea SHA-1: d5ce090d255675cca9f14ed2929f24b1561410e2 SHA-256: c4f253eadd1fffbb7293f433d2d3741fdee7086fcaa08db5d7730d4f11226bd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=pixel+5+bluetooth+issues PDF link annotation
    • http://vasvaripalmuzeum.hu/upload/file/budodakugufivuzufizod.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/58ulkqmbtqh0vvm4e1titiml59/49083422951.pdfIn PDF document text
    • http://heizler.hu/files/file/foseribom.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/52ab55bd453830d570ade51ff8ec545a/3242411536.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/41284223885.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210910175057.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/68857282224.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/geguloz.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/nerixifegujajo.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/13134664222.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/34443251946.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/zejiwuv.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/75263794100.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/jafewakof.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/mirikojedowinesipeki.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/futexo.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/delejup.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/teberadalekilikejop.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/2654647654.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/33211647471.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/98802006695.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_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 10316 bytes
SHA-256: f26bf04a5fe903a712dfbac1a4637dc186a85a828a733011f999c22f49ec4e69
font_02_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 17768 bytes
SHA-256: 0a67f2a429d8532aae221804e6be00c0d472e2a4720fd9b0186da536c64051c5

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