Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f81a202406918a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 14:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc8c83d9331edc46f92eb9913ea097f7 SHA-1: 48bc2cbdd391749ba30024a751fe695b6909218d SHA-256: b7f81a202406918a849f8a00c91c09fe7395e1d53b19593f8d7e0923e196f156
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://soepcentrale-dekeyser.be/userfiles/file/wogonubabevo.pdf In PDF document text
    • http://fu-xin.tw/uploads/files/202109071133001028.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/dezajiduxodirad.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/67336328464.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/zorupojivuledopiged.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/bolirijimuver.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/texajelisela.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/51578175461.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/tijunukagazabiwesumedibim.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/mejotonijod.pdfIn PDF document text
    • http://fpole.ru/sadm_files/55332971744.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/doribisi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/rewobuzoredavugemipuwe.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/26243982447.pdfIn PDF document text
    • http://ssp.by/var/upload/bupegubu.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/50025440469.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/negijapupi.pdfIn PDF document text
    • http://methese.com/upload/files/nipap.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161318fd0c5842---55706430665.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a153e107ff---38827937388.pdfIn PDF document text
    • http://cochemical.com/upload/files/65552822404.pdfIn PDF document text
    • http://carbonelite.ru/file/mugiloduzijurexixujal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=photo+map+apkPDF 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_off0000cc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 17804 bytes
SHA-256: b0070ccbf8d3b0dd564d6ba606f4dda4c450afdffbdd08605c4e7f0f7934794d
font_01_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 9968 bytes
SHA-256: 4d30d5615397a9c9e8abfcb67440ffdd146085ceb824695cf91a06150ad9c757
font_02_sfnt_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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