Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f7eab5915c3fb3…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 15:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33bb16e9fdfc15c6c882161b940c8f1f SHA-1: ef210a624cf838990df2c1aa95732bfa7b8eaa9b SHA-256: e8f7eab5915c3fb3684c014e7c01e92d177db36d71123861c52f6dff196c674c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ahknchem.com/upload/files/rufulere.pdf In PDF document text
    • http://asustainable.com/global/file/bagobi.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/rizegabodamiwozoxuzigi.pdfIn PDF document text
    • http://iucecb.com/files/file/zupimedo.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///77885910547.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/91214748027.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/jakolomorakapibasi.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/bejafubep.pdfIn PDF document text
    • http://kodemari.info/data/files/20633170433.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/luzixinuwikedakin.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/gutikutatimefanex.pdfIn PDF document text
    • http://schokobrunnen.com/idata/vabotemefamewafusin.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/8450381115.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/88028783006.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/91118667534.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/gikizezuvenorufitafebim.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/xawurugenonudobarowo.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1730809606613da9727afc4.pdfIn PDF document text
    • http://sswjeans.com/files/43824363002.pdfIn PDF document text
    • https://clickbox.ro/images/file/zifovabumipodoratilifuroj.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/gezegevofotesirilinevixu.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/vixetobixevumuwogeb.pdfIn PDF document text
    • https://themalc.org/files/file/69077957092.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386e61e4a5f---2155865566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fruits+basket+season+2+wikiPDF 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_off0000b171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 10572 bytes
SHA-256: 62e2395e9e9e504a2c8ccde645262f2c589965ab4368bfda00001ceee850dcce
font_02_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 18136 bytes
SHA-256: 4b9d108a4775e66c519a16138e770f13db47d62087adbc4086d424c07cba3744