Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff3875a330d87ea…

MALICIOUS

PDF

81.6 KB Created: 2021-10-16 12:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 542b8ad24fb9a836071dad7f9f631bd4 SHA-1: d1e7f0674855c4a899b68fb1e6ddc2b5e3614eb6 SHA-256: aff3875a330d87eaa23dddb8be10c4f181ddff3bec7a8a8ef4d4a2033316d67e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of a link to 'pzhjintai.com' is a primary indicator of a malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pzhjintai.com/upload/files/xatenodobopufisob.pdf In PDF document text
    • https://ehlibeytalimleri.com/resimler/files/noliwurenomidarepa.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/9694547638.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/podubokikumabedagufuki.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/24864205848.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/70954461345.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/fadijikusuna.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210927_095238_3770.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613959668fcc4---69448358753.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/21035004746.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/poxaxewabozi.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/dutipufuvesefederimomu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/k2ie9e9jilu3n0es7o7ecd86t7/tikotofutuwafanuvavodelok.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/nimasigijixedilirin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/u-9XGpgKpwY/uplcv?utm_term=natural+ecosystem+examplePDF 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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 10632 bytes
SHA-256: 0635b3a3a0234e4b576cb348d3871f2d8dbc5880a4a15a59c4a69735f574c1cd
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 18036 bytes
SHA-256: 4bf49056035094a808d08547db83ca0e6fd9d243aecc0d1b107890b8a5b86f54
font_02_sfnt_off000121a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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