PDF malware analysis — malicious · da4f47175c445d19

MALICIOUS

PDF

99.1 KB Created: 2021-09-18 10:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 86b7096e11d396b265e3bb3e9fdbf9e0 SHA-1: 92edca56e63cbdedde7423cc2723905b8e8bc317 SHA-256: da4f47175c445d19baf2c5247dcfd63560dc3e77a83759c4eb73c5b575e3ffb1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting, suggesting an attempt to obscure the final malicious destination. The embedded JavaScript likely facilitates the redirection to these external URLs, which are often used for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=ao+haru+ride+ep+1 PDF link annotation
- http://strelnicebudejovice.cz/userfiles/file/65549415698.pdfIn PDF document text
- http://begemot-rus.com/uploadfiles/file/2021091416065273499.pdfIn PDF document text
- http://studiotecnicobergamaschi.it/userfiles/files/45335080393.pdfIn PDF document text
- https://pacie.vn/web/uploads/files/28889151861.pdfIn PDF document text
- https://egokituz.eus/files/galeria/files/96363884286.pdfIn PDF document text
- http://www.maderas-navarro.com/ckfinder/userfiles/files/47692478837.pdfIn PDF document text
- http://gz-theoutfit.com/UploadFiles/FCKeditor/20210912170857.pdfIn PDF document text
- https://www.tcf.gov.tr/ckfinder/userfiles/files/3121519576.pdfIn PDF document text
- https://comillaspostgrado.es/userfiles/file/kuwuw.pdfIn PDF document text
- https://7mark3t2-7aya.com/contents/files/fuwavazowujolejudolexo.pdfIn PDF document text
- http://jyotiacademicpress.org/uploads/file/wimilasezeliwotabevukurux.pdfIn PDF document text
- https://12waktu.com/contents/files/42785235330.pdfIn PDF document text
- http://rileyillustration.com/images/agency/files/mapagexovasomiwuvorilu.pdfIn PDF document text
- http://recko.ru/ckfinder/userfiles/files/35691202782.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mi7q4dipc8ofej5bqd718up7va/bezuvolovo.pdfIn PDF document text
- http://arqing.es/ckfinder/userfiles/files/38634521873.pdfIn PDF document text
- http://faisaltowel.com/survey/userfiles/files/zatavaworipololeniziwab.pdfIn PDF document text
- http://taiwangallant.com/uploads/files/202109140516512200.pdfIn PDF document text
- https://e-fasteners.eu/media/file/17533137758.pdfIn PDF document text
- https://terminal.hr/userfiles/file/50744303412.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/168l68hkat80no2r40qgdm6p15/rutedukazuwozurez.pdfIn PDF document text
- http://www.cst.rnu.tn/js/ckfinder/userfiles/files/damodivug.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_off0001160c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1160C	10204 bytes
SHA-256: `671e8f93e6b5c89d2cf41d9e48817a9598638d794b5bcd7d44b703adcd7d2d64`
`font_01_sfnt_off00012d0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D0C	22080 bytes
SHA-256: `2b479432163d9694531c5d85ce3b4bb4ca7cf2f7db936f93313822bbc317f11c`
`font_02_sfnt_off000166bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x166BF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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