Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bd24cdf4459150…

MALICIOUS

PDF

70.4 KB Created: 2021-09-16 14:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cca4b5ec49a67dc6256cd3ffbbe0ef4 SHA-1: 340e0f0b81406bce950d685fae926d0bf3388d55 SHA-256: f6bd24cdf445915086e9eb5c3c5feee9b3b9e28427ae30e7e915a9626f2d5d2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or scam lure. The PDF structure and embedded URIs point towards an attempt to redirect the user to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=go+read+app+bookshare PDF link annotation
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/jejevivonobukofisuzezok.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132493e5fe38---modupedukapaxedejajijuw.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/81628579944.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/bexulokamobigumuz.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/dideridob.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/39351207643.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210903062428.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/36170696984.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/rusawatusuposotilubi.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/vikirewoge.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/xitag.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210912_005437_7086.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/pamemifofixiduz.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/5583291323.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/xirefiwebiwetolita.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/16207313104.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/80928773329.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/19140709344.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090207032833.pdfIn PDF document text
    • https://successalpha.team/upload/files/zotigonumap.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/34391988540.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/merogir.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_off0000b4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 10420 bytes
SHA-256: fc1aa5b9548aa908b164bd116157230b0b96cd50f7f097b800dc1a264cb37e41
font_01_sfnt_off0000cc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 15672 bytes
SHA-256: a63aff03dbd32ad5a2604fb30a27a15f98b800c92453bc1bc2bd9acaaffe2544
font_02_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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