PDF malware analysis — malicious · 7561d1e2aa8368c6

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 12:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 6e35d57ce90b865430aa923b0e5e63da SHA-1: bcf042e2bfa6e1efed6bd7dcae2a62b418b5d9c8 SHA-256: 7561d1e2aa8368c6aeec0e434ba0d3f413f4219151eb930dc0d654bf27c455e5

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external URIs, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme to distribute further malicious content. The presence of embedded JavaScript indicates an attempt to exploit vulnerabilities or perform actions directly from the PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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 https://crysiq.ru/uplcv?utm_term=what+does+a+pint+of+blueberries+weigh PDF link annotation
- http://happy-playground.gr/uploads/_uploads/files/zanidupitizodovozoreten.pdfIn PDF document text
- http://maremio.ru/admin/ckfinder/userfiles/files/falotitenigizejikorixu.pdfIn PDF document text
- http://ormansagszive.hu/upload/file/molurijavufemowenamudanog.pdfIn PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e59b650d98---24362456140.pdfIn PDF document text
- https://bustotoronto.com/userfiles/file/zenolazalumejoteloxag.pdfIn PDF document text
- https://istocdukkan.com/userfiles/files/tazijezifurutizadogaguxe.pdfIn PDF document text
- http://tano-cable.com/d/files/42172376657.pdfIn PDF document text
- http://www.prakashirrigation.com/uploads/fck/files/64208574012.pdfIn PDF document text
- https://indiansecuritisation.com/ckfinder/userfiles/files/kajelutikixet.pdfIn PDF document text
- https://dacola.com/upload/files/14891309059.pdfIn PDF document text
- http://slhospital.com/upload/fckeditor/file/diwuxonipevaxutotixi.pdfIn PDF document text
- http://edilcfcostruzioni.com/userfiles/files/tukolopikifawo.pdfIn PDF document text
- https://semagro-msw.ru/pics/images/file/83052527306.pdfIn PDF document text
- http://elesi.eu/fichiers/files/60673785284.pdfIn PDF document text
- https://totounited.com/contents/files/46032007581.pdfIn PDF document text
- https://guptajimarriagebureau.com/userfiles/file/lemutokegoputej.pdfIn PDF document text
- http://3gr-group.com/ci/userfiles/files/62612316542.pdfIn PDF document text
- http://sunwisechem.com/Uploadfiles/files/vixarafazerozor.pdfIn PDF document text
- http://www.stsmcc.org/www/js/ckfinder/userfiles/files/tedijixifamuxek.pdfIn PDF document text
- https://computerzone.pk/file/92179769233.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdf689c2ce---jixeb.pdfIn PDF document text
- https://learningsolution.ca/userfiles/files/vonobagenun.pdfIn PDF document text
- http://kyea.org/imageuploads/mikosunurepuxituxip.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000aee4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAEE4	16516 bytes
SHA-256: `b173e9e3ca86e79a6f67e5748666cae0c9c07b8743d703fc2eae5081c5152253`
`font_01_sfnt_off0000d91d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD91D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f134.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF134	11096 bytes
SHA-256: `db160188ff53c1ac55fccf72d73345391b612aea2aced67b5e434a8362a53ab4`

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