Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c20a5eb42caba65…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 06:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ece36ccc5c7420017f92d2a5103d2c0 SHA-1: 090933ea7ccb08dd19aaec6842da6a9dbc72c562 SHA-256: 2c20a5eb42caba656211d69fe271bde27b892c7314ed5befd1685bc3d54d34a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting, suggesting a redirection or download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dieterheich.de/images/uploads/file/futegiwerolaz.pdf In PDF document text
    • https://actionsporting.com/userfiles/files/52460601257.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/11566106990.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/54384870507.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/tilasewurafijederano.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/rerudijapanon.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/mulamigavaranifo.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/zotitunazemolefavumobe.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/22307696235.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/59303786037.pdfIn PDF document text
    • https://cubic.is/userfiles/file/40242353193.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/derofamewizazo.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/2126554323.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/lofedovegisepulanag.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/26313734002.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/85671692922.pdfIn PDF document text
    • http://ossokahve.com/upload/file/33770112753.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48950d4b9---labigobudazak.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/50054649353.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/pobokepisap.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/solomuxuwekudiwuzinel.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161326d41aa3b2---liwubepanudagezejuseva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=honor+v40+lite+price+in+indiaPDF 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_off0000b5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC2 17056 bytes
SHA-256: 2690d35638dba3bad255c117e2923922714a63710a0b5c5572cbce7335761e30
font_02_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 10596 bytes
SHA-256: c5592eba202ac05a652513d1748f8a2c3b612b9a5af83f6b1515b8b9a0cd925f

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