PDF malware analysis — malicious · e5f1cd6b039f929b

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 11:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ab0564e61e39b52602139dcd3f97654a SHA-1: 8bedcb743429a24f299aea13356723d62b03c637 SHA-256: e5f1cd6b039f929bdae86bd410272570aa1bab80f34924d9c8a698f7f1b4360d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous embedded URLs and is flagged by heuristics as a link farm and a browser extension installation lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish credentials. While no scripts were directly extracted, the structure and heuristics suggest exploitation for client execution, potentially involving JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://synerhu.ru/uplcv?utm_term=how+to+block+url+in+chrome PDF link annotation
- http://gr-chem.com/upload/files/86450496769.pdfIn PDF document text
- http://idrogastermoclima.it/Utentifile/FCKPage/file/ribeg.pdfIn PDF document text
- https://adlinefor.com/home/webagen/public_html/korn/data/file/18198545005.pdfIn PDF document text
- http://saovietgroup.com/upload/FCK/file/segujefenutanomuruje.pdfIn PDF document text
- https://yarpaket.ru/userfiles/file/notifa.pdfIn PDF document text
- http://mim2010.ru/userfiles/file/35059355139.pdfIn PDF document text
- https://ijieet.org/ckfinder/userfiles/files/32622886197.pdfIn PDF document text
- http://innova-perila.ru/upload/files/65272775997.pdfIn PDF document text
- http://www.benyowsky.com/resources/files/diladobomoletizozofobix.pdfIn PDF document text
- http://www.biosafety.biz/ckfinder/userfiles/files/34436356291.pdfIn PDF document text
- http://berallebags.com/UploadFiles/FCKeditor/20210901151515.pdfIn PDF document text
- http://pensjonatagat.pl/userfiles/file/fejosogofuzibuxo.pdfIn PDF document text
- https://atputasbazes.lv/images/userfiles/files/jekotasaridunolipepol.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146ea6a8afbf---30380613216.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xobakajonatir.pdfIn PDF document text
- https://olivermilk.vn/tctt/sites/aaa/file/58534724415.pdfIn PDF document text
- https://vongtaytramhuong.vn/upload/files/95975409038.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613860a920e00---17152819996.pdfIn PDF document text
- http://falconltd.pl/cache/file/tosazesenetigemepefojiviz.pdfIn PDF document text
- http://aygroupmuh.com/image/files/tubojipaxige.pdfIn PDF document text
- http://ammk.sk/userfiles/file/tuvemugib.pdfIn PDF document text
- https://ispartaorganizasyon.com/ckfinder/upload/files/93677444295.pdfIn PDF document text
- https://ajambary.com/userfiles/file/73399043375.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_off0000da32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA32	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f249.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF249	10572 bytes
SHA-256: `fd6c87b90e2acad3ca15daac2c77fa2975eb4f0b4ccccc941e6b81e8fd8d272d`
`font_02_sfnt_off00010a32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A32	18112 bytes
SHA-256: `47edf1819aa15da0db8140e16a7b3133d4501f2ca7a0190e98f93749a1c685f5`

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