PDF malware analysis — malicious · 22cd045e1b23c588

MALICIOUS

PDF

94.2 KB Created: 2021-09-16 02:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: b6dede236af49b2729dddb721a4e47ed SHA-1: 54458b85da40acf2a19761e22a528541782315ae SHA-256: 22cd045e1b23c5884e9383e88978f477385457ddfd89cae98028b120fef44451

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting an attempt to lure users to a malicious site. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9786

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 https://archism.ru/uplcv?utm_term=3x+vpn+for+android PDF link annotation
- http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33740583060.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/17419463645.pdfIn PDF document text
- http://heyumpnd.com/userfiles/file///liwazisoluwujop.pdfIn PDF document text
- https://fotofidelity.cz/userfiles/file/rurel.pdfIn PDF document text
- http://erainbowrealty.com/userfiles/file/busuluvapin.pdfIn PDF document text
- https://www.creativetalentnetwork.com/ckfinder/userfiles/files/16062565585.pdfIn PDF document text
- http://onthebroadway.com/CPD/adminpanel/upload/file/jowivovisaboduj.pdfIn PDF document text
- https://interior-mark.com/ckfinder/userfiles/files/papumagof.pdfIn PDF document text
- https://menokatea.in/ckfinder/userfiles/files/kerotopemogikazixupaz.pdfIn PDF document text
- https://yenhuy.vn/upload/files/zemabikukuwuzevomalu.pdfIn PDF document text
- https://campermagazine.tv/public/file/xewakiba.pdfIn PDF document text
- http://lhdrum.com/User_File/UpFile/file/20210916062325_bG9idXN1Z2l6b2Jvd2VmaWdvZG8=.pdfIn PDF document text
- https://tagoproperties.com/ckfinder/userfiles/files/25029388202.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/16014fd960330d6c842ee8f2734433f1/54082786708.pdfIn PDF document text
- http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/18239587944.pdfIn PDF document text
- http://houstontca.org/Content/uploads/files/38323945027.pdfIn PDF document text
- http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613267f3bc146---vapitesezet.pdfIn PDF document text
- http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/kemoxutuzenirexup.pdfIn PDF document text
- http://muaah.ca/userfiles/files/fegelitejobuberusafito.pdfIn PDF document text
- http://tofuyatogo.com/uploads/files/waxevevumogelujix.pdfIn PDF document text
- https://castilloexterior.net/ckfinder/userfiles/files/37152558212.pdfIn PDF document text
- https://bwawarszawa.pl/upload/file/90242647557.pdfIn PDF document text
- http://abakus-routing.co.uk/ckfinder/userfiles/files/bajojogisiguxu.pdfIn PDF document text
- http://sjmhospital.org/files/js/ckfinder/userfiles/files/bogimape.pdfIn PDF document text
- http://unionnutritech.com/upload/files/33616138090.pdfIn PDF document text
- https://mchs.kz/userfiles/File/91302642076.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ec8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC8D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000104a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104A4	10288 bytes
SHA-256: `271874c90cc1579fedaceab814efd3a93630cd8f7d19cf42cd14b4a9bfca0d6c`
`font_02_sfnt_off00011bdc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BDC	27884 bytes
SHA-256: `89b0a7b93e5daf2541411152f62f9a4c798930e99daef94da5028c43e4a4a50d`
`font_03_sfnt_off00016192.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16192	1936 bytes
SHA-256: `581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a`

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