PDF malware analysis — malicious · db6c1eac61dac1fe

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 17:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: ea510a0b48ecd4eb5a18feafee851fe0 SHA-1: 447230383c6f0c620efbaa2d8b454476c3c0bb85 SHA-256: db6c1eac61dac1fe7138f4d3ab29c2ab133ed777ff0bb5e22c3346f649481592

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a payment redirection lure. It contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting an attempt to obscure the final malicious destination. The primary attack pattern involves a phishing lure, likely delivered as a spearphishing attachment, aiming to trick users into clicking a link that leads to credential harvesting or financial fraud.

Machine Learning

Nyx PDF Classifier malicious score 0.9961

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
Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE

Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
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.
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=computer+and+communication+networks+2nd+edition+pdf PDF link annotation
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16131704089d97---76930731634.pdfIn PDF document text
- http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/mujevudir.pdfIn PDF document text
- https://augsburger-dartliga.de/uploads/file/denomimewugow.pdfIn PDF document text
- https://hoangvan.vn/wp-content/uploads/files/meniridunonebo.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340824a50cb---vuzakugebip.pdfIn PDF document text
- http://gmkms.net/upfile_editor/2021/files/pazojezileninupazo.pdfIn PDF document text
- https://studyhalltracker.com/files/file/60320918655.pdfIn PDF document text
- http://yejida.com/userfiles/file/rubazamekakoresibajateteb.pdfIn PDF document text
- https://xn--80ag1a2a.xn--p1ai/files/file/72615899977.pdfIn PDF document text
- https://bodymason.com/user_uploads/files/komuwasipawoxagidolaxe.pdfIn PDF document text
- http://elektromig.pl/userfiles/file/647101602.pdfIn PDF document text
- https://pmms-online.com/assets/file/feliwogifedofotivagobadi.pdfIn PDF document text
- http://fatfailogistics.com/fckeditor/files/file/xunejibip.pdfIn PDF document text
- http://luchetti.it/userfiles/files/bafufozigekixusikonanomos.pdfIn PDF document text
- http://jimsclub.net/new/board/img_tinfo/file/20210910163707.pdfIn PDF document text
- http://riverside-plaza.com/upload/userfile/files/nofida.pdfIn PDF document text
- http://aaykpn.com/uploads/editor/files/40508063262.pdfIn PDF document text
- http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jopuwavolobalup.pdfIn PDF document text
- https://vespaclubcagliari.com/userfiles/file/28827162324.pdfIn PDF document text
- https://bloomeng.com/uploads/wovezisasavonuw.pdfIn PDF document text
- http://tantex.org/tantex/tantexuserfiles/file/fevawogubixewuguxafufepov.pdfIn PDF document text
- http://cyc.cz/pictures/clanky/files/gogulufalex.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_off0000e838.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE838	11164 bytes
SHA-256: `337ef3c86f564c5fc36cd2050c8511398a2f351e16d11c763c64b5a8dd622e7c`
`font_01_sfnt_off00010275.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10275	17688 bytes
SHA-256: `60a1d9ce45820c93df755339342f7beec50d48d3e556ffa55d535ca647c91616`
`font_02_sfnt_off00013010.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13010	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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