PDF malware analysis — malicious · a8c08519331340f2

MALICIOUS

PDF

71.7 KB Created: 2021-09-29 02:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 66ab8c7afa362e8c83d0a80a2e6dc64a SHA-1: 695a6d6719496851299c5e9aa00105c2d230012f SHA-256: a8c08519331340f2efe210042b23d092fcffabdf634d674f30eff2ee4ad3d12c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Heuristics indicate a high likelihood of phishing and malicious intent, with ClamAV specifically identifying it as a 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged the PDF as malicious. The presence of embedded URLs and the link farm structure suggest the primary goal is to redirect users to malicious or scam websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 5

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.
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://ketchas.ru/uplcv?utm_term=3d+clustered+column+chart PDF link annotation
- http://sumtinathholidays.com/admin/uploadfiles/file/18428397317.pdfIn PDF document text
- http://canshu.dlzj.net/upload/files/20210917184607970415.pdfIn PDF document text
- http://sunmoon-glory.com/web/upload/files/sijewapobevelodujotasiti.pdfIn PDF document text
- https://doublehair.center/upload/ckfinder/files/28854436884.pdfIn PDF document text
- https://sayurhijau.com/contents/files/tuguko.pdfIn PDF document text
- http://topoint.net/userfiles/fckFile/20210925205904.pdfIn PDF document text
- https://samirkumarpaul.com/ckfinder/userfiles/files/kikakubujax.pdfIn PDF document text
- https://nayyaralidada.net/alpha/ckfinder/userfiles/files/gibejewaxomotinuxadalo.pdfIn PDF document text
- http://plan.msu.ac.th/ckfinder/userfiles/files/27664611441.pdfIn PDF document text
- https://petribax.nl/userfiles/file/lologutabubupenow.pdfIn PDF document text
- https://csmgh.net/pevron/www/img/file/gopevimosodizoninegosar.pdfIn PDF document text
- https://watosaphotography.com/app/webroot/userfiles/files/20210916_000207.pdfIn PDF document text
- https://nayyaralidada.net/alpha/ckfinder/userfiles/files/33798676206.pdfIn PDF document text
- http://www.halpellet.hu/userfiles/files/48139345547.pdfIn PDF document text
- http://vodnik48.ru/content/file/sovitawelimo.pdfIn PDF document text
- https://iasvn.org/Images_upload/files/64822511973.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f254bdd7248052a6a215702466a6042d/gepevubedibaw.pdfIn PDF document text
- https://rrr71.ru/upload_picture/64408960979.pdfIn PDF document text
- http://dreamsurgerycn.com/ckupload/files/59312897161.pdfIn PDF document text
- http://hotelrealerimini.it/userfiles/files/70598460547.pdfIn PDF document text
- https://10s317.com/uploads/files/202109072021318346.pdfIn PDF document text
- http://haliburtonhighlandsheritage.ca/userfiles/file/vakerat.pdfIn PDF document text
- https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/nibibipazibimeveb.pdfIn PDF document text
- https://eastoncn.housemember.com/uploads/files/vopizugudux.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb2c9ae8e2---12836523557.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_off0000b3a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3A1	10720 bytes
SHA-256: `4ce1560c9fc8db15d66acde3a000b92f064631042d10a6a78722904a16d81a84`
`font_01_sfnt_off0000cc0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC0F	17928 bytes
SHA-256: `2be484d9be8904bc8e06d59f30ec5c02395e54a4a64ba09b8063798ae652bc49`
`font_02_sfnt_off0000f952.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF952	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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