Malicious PDF — malware analysis report

Static analysis result for SHA-256 3735596800224a26…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 07:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c45a338c2fc68b6856c93a940e465b2 SHA-1: a0b79780b95874763475be63eb6a7132e590ecf6 SHA-256: 3735596800224a2651fa4fe032bf49580b92d32cd9dcbc78a582dc73453b45d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. ClamAV detected this as a phishing trojan, and the ML classifier also flagged it as malicious. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://irinka.org/ckfinder/userfiles/files/dadoz.pdf In PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/79789412378.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/52224389962.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210903232610_274231721.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/72795691576.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/50611141831.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/tezinaxenegolenilaxopeti.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/turitasakefiwu.pdfIn PDF document text
    • http://master-br.ru/img/file/fuxoro.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/sexano.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/vomafibusat.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/gabuzatemezusa.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/noxikotovafowow.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/39230329685.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/jiloxitizile.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/dusun.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/pifiva.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/gubijizugigitixa.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/99812560974.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/27840542745.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/lusapelozoje.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/63115789939.pdfIn PDF document text
    • http://findusafranchise.com/files/files/13052445977.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/wavubonopuwiwanumoxago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=strayer+ways+of+the+world+online+textbook+pdfPDF 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_off0000b507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD19 17328 bytes
SHA-256: b3688f33f8db1b823d18c02ee23b126dc46b7cf6c33cb5895018306465253715
font_02_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 11204 bytes
SHA-256: 6af263a81a96844c0aafc455e60fe1a14bc75fa6232754a82b1ecda8e2b1f960

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