PDF malware analysis — malicious · 1c9f6f11b8c8a8ab

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 00:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 2d587a9643c5b9e050a762c032030902 SHA-1: 91f6408db18f3ffa1f1c5bed20d559109eb45088 SHA-256: 1c9f6f11b8c8a8ab1deb29499080fbe2223aaee949f67d24e77e06fd87450a72

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. 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. The embedded URLs, while many are unknown or benign, suggest a potential distribution or staging point for further malicious activity.

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 http://wxmx.cn/upload/ckimg/files/202109131817017400.pdf In PDF document text
- http://henzefashion.com/userfiles/file/65290102799.pdfIn PDF document text
- http://ducthoaudio.com/upload/files/5607564829.pdfIn PDF document text
- https://rainbowfurnitures.com/files/files/14693725250.pdfIn PDF document text
- https://akilanews.com/ckfinder/userfiles/files/52451725351.pdfIn PDF document text
- http://stringquartet.biz/web/images/fck/file/34759199315.pdfIn PDF document text
- https://topinsolventa.ro/userfiles/file/40660706690.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341f39bf470---tipukatizidil.pdfIn PDF document text
- http://alarm.pl/userfiles/file/28987584070.pdfIn PDF document text
- https://padservhosting.com/userfiles/file/janatasamoxebapofemim.pdfIn PDF document text
- http://www.anjhimayath.com/upload/file/nawosenovuniwarozimufin.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431bd5ab2e9---59278094566.pdfIn PDF document text
- https://estudiowebcolombia.com/ckfinder/userfiles/files/xepurevowuk.pdfIn PDF document text
- https://fzclicks.com/demo/files/editor/file/72700903289.pdfIn PDF document text
- https://turasmobilya.com/img/editor/image/file/wutebike.pdfIn PDF document text
- https://yensaovinastar.com/media/files/91145171377.pdfIn PDF document text
- https://e-uchebnici.com/img/file/mupukusesubenonawalem.pdfIn PDF document text
- http://www.peritaonline.es/ckfinder/userfiles/files/nokezukaja.pdfIn PDF document text
- http://pneusmarene.it/images/file/85156079702.pdfIn PDF document text
- http://tonyprins.nl/images/uploads/file/92244793854.pdfIn PDF document text
- https://smwebtechnology.com/arishayurveda.com/userfiles/file/49815817253.pdfIn PDF document text
- http://namhungholdings.com/uploads/ckfinder/files/3978119839.pdfIn PDF document text
- https://capital-publishing.com/ckfinder/userfiles/files/44330251792.pdfIn PDF document text
- http://shrlie.com/upload_fck/file/2021-9-9/20210909040235746764.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+view+hidden+folders+in+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_off0000d07c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD07C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e893.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE893	10592 bytes
SHA-256: `5ade8b5406074f88e65dea5e50d544c34ff1e998fb105e248f47ec6a48cccd7b`
`font_02_sfnt_off000100b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100B3	18564 bytes
SHA-256: `2225ea203b24edef6edcc9ce95cc1eccab8a67b29887f952ca2d08940206495a`

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