PDF malware analysis — malicious · 3733654e4d4e5d4e

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 20:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 0c22de77092146e9f32b484e98cd43cc SHA-1: 084b272a8ff140c1be19ca7f6658225e18f0b969 SHA-256: 3733654e4d4e5d4ef693621e4115ff45d43d4d102a3b188d95b3100718272196

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to exploit vulnerabilities or redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a number. The ML classifier and ClamAV detection further support its malicious nature, likely involving exploitation for client execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://irlanc.ru/uplcv?utm_term=how+do+i+change+my+gmail+account+on+my+android+phone PDF link annotation
- http://flexinform.com/hirlevel/file/ferexovesan.pdfIn PDF document text
- https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/gedanezapemixarokavevuri.pdfIn PDF document text
- https://traveletrust.com/basefile/traveletrustcom/files/84276149185.pdfIn PDF document text
- http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/95228964467.pdfIn PDF document text
- http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/41696676898.pdfIn PDF document text
- http://ilkemymm.com/image/files/pomatowumulasixunamor.pdfIn PDF document text
- http://namhungholdings.com/uploads/ckfinder/files/vikoxarozitebunori.pdfIn PDF document text
- http://gattoneva.pl/pages/userfiles/file/fitadijitedawalo.pdfIn PDF document text
- https://angel-juicer.com/FileData/ckfinder/files/20210919_4140B5F4FF91DCFF.pdfIn PDF document text
- http://salamatekhanevadeh.ir/ckeditor/files/files/70789077934.pdfIn PDF document text
- http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/50084256730.pdfIn PDF document text
- https://www.cylinder96.ru/admin/ckfinder/userfiles/files/valajepiz.pdfIn PDF document text
- http://zussobrance.sk/grafika/dokumenty/tajikelenu.pdfIn PDF document text
- http://xaydungphongphu.com/uploads/files/tapovebomevo.pdfIn PDF document text
- http://djpress.pl/Image/files/55153341499.pdfIn PDF document text
- https://fiberglasssupplydepot.com/userfiles/files/ridotugodoniwa.pdfIn PDF document text
- https://macauroommate.com/ckfinder/userfiles/files/tekotaka.pdfIn PDF document text
- http://scard.vn/app/webroot/uploads/files/jiveju.pdfIn PDF document text
- https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e3000321---lavotidukuridira.pdfIn PDF document text
- http://naturalmis.com/userfiles/file/nobilosobizenexut.pdfIn PDF document text
- http://icsbc.ru/fuploader/file/difolerovofokazosoloba.pdfIn PDF document text
- https://muratay.nl/userfiles/file/41599859156.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446dc4b1974---wakefifefubowevaximono.pdfIn PDF document text
- https://bocrangsuthammy.vn/upload/files/vimafifiwakezutifelidujij.pdfIn PDF document text
- http://foto-recepty.sk/images/fotky/22045528032.pdfIn PDF document text
- https://dogathermalhotel.com/resimler/files/43932440343.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_off0000d5cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5CC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ede3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDE3	11084 bytes
SHA-256: `1da3db5963e68b6db4c06ec526605ca106d5ea09238eb04c8dafc65440464451`
`font_02_sfnt_off00010751.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10751	17560 bytes
SHA-256: `8f22c29d5aa7e0a6d6ca6cd37a6d8d1994e048bed23fc04b4cd4435befb171a0`

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