PDF malware analysis — malicious · a4e0091d79038cbd

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 21:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 47096a774a8bf9ec17a685c2754baef8 SHA-1: 04c66a51106c8ee9a7f983c8cd9fd05c4f0e5036 SHA-256: a4e0091d79038cbdc4e97a155a88ad98eb23ed8f49eb04dfb97b5803ba0b0a83

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute further malware or conduct phishing attacks. The presence of multiple distinct hosts and a high number of links suggests a coordinated effort to host malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=resso+app+music+ringtone+download PDF link annotation
- https://masukpt2.com/contents/files/54373920666.pdfIn PDF document text
- http://tw-sincere.com/upfiles/editor/files/dower.pdfIn PDF document text
- https://propertiproperty.com/Uploads/userfiles/files/lewofitunudiz.pdfIn PDF document text
- https://nhahangbienhaitien.com/uploads/files/lolulabibogolij.pdfIn PDF document text
- http://thevisionkharj.com/userfiles/files/dufiremikazuwexel.pdfIn PDF document text
- https://hung168.tw/UserFiles/files/fojokuxipi.pdfIn PDF document text
- http://eamenfaraz.com/cache/fck_files/file/25631208780.pdfIn PDF document text
- http://banglenhospital.com/UserFiles/File/duwisosujijapujaxavetokix.pdfIn PDF document text
- https://avenue102.com/uploads/file/zinibivogojapelosisera.pdfIn PDF document text
- http://logenamerica.com/userfiles/file/12892197286.pdfIn PDF document text
- http://tsutae-f.com/js/upload/files/dipebagonobujowil.pdfIn PDF document text
- http://gabinetortodontyczny.eu/userfiles/file/jajetor.pdfIn PDF document text
- http://ps-chiptuning.hu/userfiles/files/47930996885.pdfIn PDF document text
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/15bulj3oocdkpnti4knpf442r3/49055721432.pdfIn PDF document text
- http://vyveva.eu/UserFiles/File/26046968970.pdfIn PDF document text
- http://hangtatmj.com/userfiles/satagomowunudukodonax.pdfIn PDF document text
- http://bienbao.org/uploads/files/ridisapewebuditawazogil.pdfIn PDF document text
- http://gayaarchi.com/userfiles/file/20210910155109.pdfIn PDF document text
- http://gewald.ru/content/Files/mewag.pdfIn PDF document text
- http://secretinvitation.net/images/files/86715844124.pdfIn PDF document text
- http://dogomanhnghia.com/uploads/files/61503926449.pdfIn PDF document text
- http://mynotary.ca/sites/all/sites/mynotary.ca/files/90784856421.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161342ca347c08---72368177970.pdfIn PDF document text
- http://cpghollywood.com/userfiles/files/rakofuvitajew.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_off0000dea8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEA8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f6ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6BA	17368 bytes
SHA-256: `708cbde6962745de38bccd7ffe5062321d56060c84040fd725f52a7eb8cc050d`
`font_02_sfnt_off00012364.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12364	11088 bytes
SHA-256: `3f4811f2b81a6fec657b9e57ff306a7c6ed221a29d25d4fc3d331cace4b576dd`

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