PDF malware analysis — malicious · 81a74f43654a6c58

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 07:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 1be5563f830924a6eba0dd93f2187741 SHA-1: 12677f7f766e291a594e45e5cfaf87fb30ef4a1b SHA-256: 81a74f43654a6c58af46e8acb3cffc30aa947ff3d263a4101271e1e4e9322eb9

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a command-line interface, a common tactic for executing malicious commands. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction to download and execute a secondary payload, likely via one of the embedded URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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
Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE

Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
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://used-machinetools.ro/app/webroot/files/userfiles/files/43990115087.pdf In PDF document text
- http://kartinatv.org/uploads/files/97939036168.pdfIn PDF document text
- https://mtydizayn.com/userfiles/file/pivivevuxitikagesajetelo.pdfIn PDF document text
- http://rc-modeller.se/images/file///kezoduxezomogude.pdfIn PDF document text
- https://lingchuanfloor.com/app/webroot/userfiles/files/92508912575.pdfIn PDF document text
- http://itagqatar.zajeltel.com/itag/file/files/34472930411.pdfIn PDF document text
- http://jlm-kg.com/uploads/file/86146119382.pdfIn PDF document text
- http://goodlack.cz/userfiles/file/19089495406.pdfIn PDF document text
- http://heryeryesil.com/resimlerfiles/xorivifiwebesarimurubi.pdfIn PDF document text
- http://www.ufolep-69.com/contenus/files/69670441855.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/makarudimewulax.pdfIn PDF document text
- http://jocoseatee.com/userfiles/files/29352176060.pdfIn PDF document text
- http://henghuitong.com/jingkelun/userfiles/files/20210917013131.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613865f34e885---40967823570.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/99724734e51f0f794418919bb0581e0a/ranesunilegapu.pdfIn PDF document text
- https://mylin.in/ckeditor/ckfinder/userfiles/files/nufujozap.pdfIn PDF document text
- https://tidurmalam.com/contents/files/zibegugelivaxinilaxo.pdfIn PDF document text
- http://lblussana.it/images/file/mosinasimozakan.pdfIn PDF document text
- http://qiuyutv.com/userfiles/files/20210915075240.pdfIn PDF document text
- https://lolakarimova.uz/ckfinder/userfiles/files/finedigukujopemanuf.pdfIn PDF document text
- http://prime42.ru/userfiles/files/40190687221.pdfIn PDF document text
- http://thermogroup.ru/uploads/files/xukesakozid.pdfIn PDF document text
- http://holidayinntorino.com/userfiles/files/71126245172.pdfIn PDF document text
- http://alconsprom.ru/ckfinder/userfiles/files/wifivu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+undo+update+on+androidPDF link annotation
- 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_off0000d803.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD803	10348 bytes
SHA-256: `b1e282c38209758c2df45f814b2773679107fb8962163aad19c1a53b5d7aa011`
`font_01_sfnt_off0000ef75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF75	17096 bytes
SHA-256: `6d2092dc26fdf8b0f841d796677eb4ec6b2d63417f99608c70e61e55f8b36487`
`font_02_sfnt_off00011b9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B9F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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