PDF malware analysis — malicious · 19878e758f2b15d3

MALICIOUS

PDF

73.9 KB Created: 2021-09-20 05:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: cbabbcf6eb476c299d2f14e669b32c84 SHA-1: 773fc934a832f97102e29403719aad71b4eb4255 SHA-256: 19878e758f2b15d372c50f44baba5ec2f9c3712a55e425048e03446644f8d9a3

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests this is a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection confirm its malicious nature, likely exploiting PDF vulnerabilities to execute code.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=adblock+in+uc+browser PDF link annotation
- https://booking-news.hkdnracing.com/webroot/editor-uploads/files/ladabapalozejijari.pdfIn PDF document text
- https://33mobility.net/uploads/files/9829898619.pdfIn PDF document text
- http://halanmilk.com/upload/files/44088557583.pdfIn PDF document text
- http://geodeslaboratori.eu/userfiles/files/81977712152.pdfIn PDF document text
- http://oris-am.com/editor_up/butukexetokuruzo.pdfIn PDF document text
- http://dh-life.com/ckfinder/userfiles/files/91444825804.pdfIn PDF document text
- http://psychanalyste-gard.fr/ckfinder/userfiles/files/subesewuw.pdfIn PDF document text
- https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d4bcc5a11cf0f2641a36d68b1285a75b/39427954405.pdfIn PDF document text
- https://gaadalagi.com/contents/files/lesapivisejusolat.pdfIn PDF document text
- http://szao-spb.ru/images/news/file/bupofivegilebaborat.pdfIn PDF document text
- http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/163092268674.pdfIn PDF document text
- http://lafiestadelmoto.cz/files/file/wukizolukunugodapazim.pdfIn PDF document text
- http://www.stsmcc.org/www/js/ckfinder/userfiles/files/wuteg.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9c4bf3d9---53026073119.pdfIn PDF document text
- http://hamdannepal.com/userfiles/file/98983491941.pdfIn PDF document text
- http://insightonafrica.in/userfiles/file/redemudojowafigidu.pdfIn PDF document text
- http://vin-baietii.ro/ckfinder/userfiles/files/rodof.pdfIn PDF document text
- http://chickenwild.com/upload/contents/images/images/61265410872.pdfIn PDF document text
- https://grandhotelushba.com/userfiles/file/xobezimil.pdfIn PDF document text
- http://teplo76.ru/uploads/file/dojijuzonomadonumosozivu.pdfIn PDF document text
- http://cn-polylysine.com/d/files/75090356581.pdfIn PDF document text
- http://mtegl.wsystem.sk/userfiles/files/sumajuxolisakafitelo.pdfIn PDF document text
- http://fioredda.com/userfiles/files/53601146356.pdfIn PDF document text
- https://hiperaktivite.info/userfiles/files/jaliwef.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_off0000beb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEB4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d6cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6CB	10504 bytes
SHA-256: `90bf1c6b53c04ae5ba4bb9b1b5c846bc5646e9d9d03bae314d10ee5dafd4b4df`
`font_02_sfnt_off0000eed3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEED3	16648 bytes
SHA-256: `8f3842bbb2c99e825d5dd72bec3b5a366fa1019af49c528c4fcfd41d124b538a`

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