PDF malware analysis — malicious · 9a2755a611e14e02

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 01:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 3727d0b3d83a6dc88b1c18f1f3fb1583 SHA-1: 8fb9abc83d3fddac0e97de0ee3147fb224bcda8f SHA-256: 9a2755a611e14e0232aa72a9a3c9f2d6bf13ab78b888776723a38e75dffdb193

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script is likely responsible for redirecting the user to external URLs, as indicated by the numerous external URIs found. The ML classifier and ClamAV detection strongly support the malicious nature of this file, classifying it as a phishing or trojan distribution mechanism.

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://oniceh.ru/uplcv?utm_term=m+power+apk PDF link annotation
- https://robert-zauer.cz/userfiles/file/mosevivitekenuw.pdfIn PDF document text
- http://dlzj.net/upload/files/20210927105936130778.pdfIn PDF document text
- https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/86797682287.pdfIn PDF document text
- http://maturitni-ples.eu/UserFiles/File/dilerivositali.pdfIn PDF document text
- http://www.de.ruben.pl/ckfinder/userfiles/files/sulafelazej.pdfIn PDF document text
- https://thuaphatlaihanoi.net/uploads/files/jakarejovuzafemi.pdfIn PDF document text
- http://le-bouquet.be/userfiles/files/titikozoruxuw.pdfIn PDF document text
- http://to-tuong.com/media/ckfinder/files/9097300735.pdfIn PDF document text
- http://medica-eg.com/userfiles/file/30850722015.pdfIn PDF document text
- https://fallsplat.se/bildbank/file/vidibofakukejaxuvenezex.pdfIn PDF document text
- https://silatur.com/js/ckfinder/userfiles/files/49243200694.pdfIn PDF document text
- https://tradegateindia.com/userfiles/file/tuxarufikanavimugesokutes.pdfIn PDF document text
- https://12waktu.com/contents/files/17618988746.pdfIn PDF document text
- http://mariamozharova.ru/uploads/files/woronanujenuvulixirisegaf.pdfIn PDF document text
- http://elliptical-trainers.ru/ckfinder/userfiles/files/kenoxiwowapagivowukase.pdfIn PDF document text
- http://tivatijapan.com/uploads/userfiles/file/87136829020.pdfIn PDF document text
- http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614823e0488ba---4406445943.pdfIn PDF document text
- http://nordicwalkingturak.hu/_user/file/4598400777.pdfIn PDF document text
- http://kondicionery-noginsk.ru/upload_picture/file/vodiwisalamojukas.pdfIn PDF document text
- https://spandoekland.nl/userfiles/file/55155795317.pdfIn PDF document text
- http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pevoku.pdfIn PDF document text
- https://nonbodepsg.com/uploads/files/71059468776.pdfIn PDF document text
- https://idealist.ro/userfiles/file/65655960015.pdfIn PDF document text
- https://mangonebike.com/uploads/file/20645784773.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_off0000b644.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB644	9908 bytes
SHA-256: `592624bf564e8295696d9c1c8a5ae7c3bde8d0e121f33f3336fbed9312d457a0`
`font_01_sfnt_off0000cc51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC51	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e463.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE463	18508 bytes
SHA-256: `739bc98fd4c4fcf6e1e42af6fd106cdb70d5e0afd57f6b9d5c1d8bf82af6e6ff`

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