Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1feb6b17a3c174…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 02:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a1cd560cb39a7f775e92c73edc96b2f SHA-1: 90b60eb28958954ab14eccaf7e4f92a74dea5f06 SHA-256: 9b1feb6b17a3c17453c355c089a565f4d3a26e6b8d74c65994c9d74f3445e1cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, and heuristic analysis identified it as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=hsmtmts+online+full+episodes PDF link annotation
    • http://sz-nuoyi.com/Upload/file/2021090514490126921.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/33261840101.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/pajigu.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/7021593726.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/54180506009.pdfIn PDF document text
    • http://taociren.com/upload/file/210911020343773501j6gor8ua9onc.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/13220511611.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/75544051494.pdfIn PDF document text
    • http://scsychem.com/upload/files/81926016217.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/97539988805.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/91035064206.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/dolelufin.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/muveroj.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/80096218931.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/wogukawitoxorolarese.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/jadorerisibanid.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/49091545379.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/vixifejunujexoputo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1bfed7664e0433bcb6caa2691b2a928c/fubosenilamuxefitoxu.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/fatugidakanigib.pdfIn PDF document text
    • http://lagrupacio.cat/file/gozilomifipiwuvoku.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/vabalalak.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210920150027.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/75504278332.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/8662660243.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_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 17320 bytes
SHA-256: abe964df9afb4dc18a572efc817f53b86941d4c382fb28dc12daf2c7ad404eaf
font_01_sfnt_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 10488 bytes
SHA-256: 445f41db5adca2bfe7434f76155b5a4c969e475c816f73b5f66f5793889f679f
font_02_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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