PDF malware analysis — malicious · 892bf2910098500a

MALICIOUS

PDF

78.6 KB Created: 2021-09-24 06:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 70286fda29a6bdaed6e74fcf5338bf8d SHA-1: a1193339596d3d1e5033d50cedd7c2db9b1faedd SHA-256: 892bf2910098500a33e7871840024c40034ff56d94e2f1b500054ad412b93b3a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are 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 a common technique for initiating malicious actions within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=pockie+trainers+download PDF link annotation
- http://cellfruits.com/ckfinder/userfiles/files/17249149874.pdfIn PDF document text
- https://www.hkha.com.hk/ckfinder/userfiles/files/22525906199.pdfIn PDF document text
- http://sumosushingrill.com/uploads/files/90753302249.pdfIn PDF document text
- https://huanghecables.com/d/files/8701747221.pdfIn PDF document text
- http://rlmlaw.com/images/edit_images/file/sapetufovuwa.pdfIn PDF document text
- http://www.deopendeur.org/imgUser/file/vomodit.pdfIn PDF document text
- https://cursosadistanciayonline.com/medios/files/bosunukukepevuwiruzisefe.pdfIn PDF document text
- http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/dukovasezikubu.pdfIn PDF document text
- https://sunnyvale.com/wysiwygfiles/file/84397767554.pdfIn PDF document text
- http://scuolascifondocortinadolomiti.it/userfiles/files/85530568908.pdfIn PDF document text
- https://perfectprojects.ro/userfiles/file/66981848324.pdfIn PDF document text
- http://garagehayashi.com/js/upload/files/gatulat.pdfIn PDF document text
- https://strategieb2b.com/userfiles/file/tipebibekibipogujiga.pdfIn PDF document text
- https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/41600936458.pdfIn PDF document text
- http://noxsun.com/jingkelun/userfiles/files/20210920054826.pdfIn PDF document text
- http://webantikvarium.eu/tmp/gosutupebubeduximadixida.pdfIn PDF document text
- http://talleresjpg.es/img/file/golazazutixadozasonawim.pdfIn PDF document text
- http://www.thaiboat.net/image/upload/File/58195411819.pdfIn PDF document text
- http://kielcenoca.pl/files/file/26585519228.pdfIn PDF document text
- http://skomi.ru/img/files/file/wumuxegilubuzis.pdfIn PDF document text
- http://x04ydivan.ru/userfiles/file/36062118032.pdfIn PDF document text
- https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614b93cea59b3---96563786830.pdfIn PDF document text
- https://angkaganjil.com/contents/files/fenutabusadoxi.pdfIn PDF document text
- http://clinicaveterinariaalbese.eu/userfiles/files/vimegefora.pdfIn PDF document text
- http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuzijifetaxosunixe.pdfIn PDF document text
- http://pileki.com/imgup/file/3624494835.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_off0000c92f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC92F	19480 bytes
SHA-256: `00d5a07769da8a1456d24c798f6f65b96d25fc2e718d0e10c635b97fe1775017`
`font_01_sfnt_off0000fbe3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBE3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000113fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113FA	10544 bytes
SHA-256: `8bf486fcbd2833a17c22be1e0ca0ba047fbb48fef8481c819f51af7d817c1686`

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