Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0c3fd0bc2ac221…

MALICIOUS

PDF

71.4 KB Created: 2021-09-22 19:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 193d1cddf1bf693d08bd06c40ac87727 SHA-1: 23723d2c1b49c04f26fbe4586596cab12b9bb6c0 SHA-256: 5d0c3fd0bc2ac2213d06bfd8701b3a992917061ef4d32ffe0c0bb25843ac525e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests these links are used to distribute malware or conduct phishing attacks. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://proclima-membranes.ru/userfiles/file/taliwewore.pdf In PDF document text
    • http://gusanhightec.com/userData/board/file/57493776926.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/73262695606.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/kivukaxakejoje.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nutiwaragobakurujadives.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/574561988.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/luwavafasojevovuzowov.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/42330314972.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/malarusoguwajufiwu.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/xefatabubabebeforam.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/pulati.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/tawax.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/31477451133.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-21/20210921135032820274.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8ec1816fda47566d3b54fee7720952e0/45550505646.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10f544262---gonubedakopazazunerifida.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-6/20210906135138457430.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/69547319965.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/60842812990.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/85817500330.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/56521070647.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/jojamuvutedivopebisedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=junooniyat+full+movie+torrentPDF 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_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB87 17416 bytes
SHA-256: 48b50427997782af1320a374272f6b1af5aae77d432e9dabe1514d50eed8edbd
font_02_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 10480 bytes
SHA-256: ff5ba9949f6d3b72c26d537a3ea500b639546be8e4a66fe191df2238004eac55

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