PDF malware analysis — malicious · cb03b708cdb3aac5

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 05:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 974eeebd678e46f5f912e4f2297db8f4 SHA-1: 96dfffc368e2bb2c5972332b23bced76c874a6dd SHA-256: cb03b708cdb3aac5ef4e161e1390aac006f52d5b43b6666fa4224767fe5a05f7

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, a common technique for exploiting PDF viewers or delivering malicious content. The PDF also functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. This behavior strongly suggests an attempt to phish for credentials or distribute further malware, aligning with the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://polymer-optix.de/userfiles/file/50893712413.pdf In PDF document text
- http://okcashbagusa.com/uploads/files/dutanorupexapilulumurin.pdfIn PDF document text
- http://cdkuysuujk.handysociality.com/upload/files/67295516750.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0c7aac1e---64115727884.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16135849c2852e---18053677087.pdfIn PDF document text
- http://hondasushi.com/uploads/files/jamimikumutovikudivaviru.pdfIn PDF document text
- https://www.akilciilacdernegi.com/ckfinder/userfiles/files/kasujugevipoxejaxokeko.pdfIn PDF document text
- https://vegas-shop.net/uploads/files/falufosepuvogo.pdfIn PDF document text
- https://apaman.ti-am.jp/js/ckfinder/userfiles/files/41873183185.pdfIn PDF document text
- http://tanphatinst.com/vietkiendo/upload/file/pafujegejeg.pdfIn PDF document text
- http://cuacuonnhaxuongbinhduong.com/upload/files/68680202419.pdfIn PDF document text
- http://zhengfutz.com/v15/Upload/file/202196830211036.pdfIn PDF document text
- http://jafra-com.at/userfiles/file/jatoduwivas.pdfIn PDF document text
- https://china-glass-mosaic.com/userfiles/files/20210912_225105.pdfIn PDF document text
- https://dnsbp.com/all4help/fckuserfiles/file/9433583601.pdfIn PDF document text
- https://iwanbim.com/userfiles/files/82170527087.pdfIn PDF document text
- https://iieng.org/editor/ckfinder/userfiles/files/31748577080.pdfIn PDF document text
- https://globalybm.com/ckfinder/userfiles/files/1631491253.pdfIn PDF document text
- http://pretaporter-pegah.com/userfiles/file/64660165245.pdfIn PDF document text
- https://treasurehunterdetectors.com/ckfinder/userfiles/files/mibiwikuva.pdfIn PDF document text
- http://statsale.com/data/upload/ck/files/94962918519.pdfIn PDF document text
- http://thai-apsproducts.com/file_media/file_image/file/bavirebadesavu.pdfIn PDF document text
- https://adlinefor.com/home/webagen/public_html/korn/data/file/16676201581.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+robux+websitesPDF 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_off0000cd13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD13	16556 bytes
SHA-256: `a6efa837406212b97be58eb482ebd4cb8fc0aa38b74d9632368ce096cc254481`
`font_01_sfnt_off0000f7e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7E5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010ffc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FFC	10268 bytes
SHA-256: `dddb7ca98ee1e55ec24b84e8e457c18df0887aed2c1eb4e33b63b1d1057fe37b`

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