PDF malware analysis — malicious · bf703cf4efa0abe1

MALICIOUS

PDF

91.7 KB Created: 2021-09-11 12:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: eea53915c0a33652d39c96e0792e4440 SHA-1: b11d99aa7a12cc00df644ee450bfe855c4836f21 SHA-256: bf703cf4efa0abe1d01ae272599d1a3a97c0129bc1c88fc5ae78c11416505433

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further support the malicious classification, indicating the file is likely a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://csc0731.com/userfiles/file/20210911055745_wb3g0e.pdf In PDF document text
- https://divetechmarine.com/contents/files/87279256634.pdfIn PDF document text
- http://www.tiande-global.com/ckfinder/userfiles/files/pigedavelixeboxuvafikiri.pdfIn PDF document text
- https://hotelite.in/userfiles/file/pizoriwolezavobufate.pdfIn PDF document text
- http://queensparkview.com/image/upload/File/57352309193.pdfIn PDF document text
- http://nacyc.jp/Upload/file/semuxobosugeragi.pdfIn PDF document text
- http://sarica.com.tr/ckfinder/userfiles/files/53240648374.pdfIn PDF document text
- http://thibidi.vinadesign.info/uploads/images/files/95357488876.pdfIn PDF document text
- https://resulgame.com/calisma2/files/uploads/34432822154.pdfIn PDF document text
- http://gordostcrista.ru/userfiles/file/bugumiliviwurovimopabexed.pdfIn PDF document text
- http://brukbet.com/user_images/file/85427094720.pdfIn PDF document text
- http://jfac.kr/ckfinder/userfiles/files/wosovozepa.pdfIn PDF document text
- http://conservativista.com/js/ckfinder/userfiles/files/4040376308.pdfIn PDF document text
- https://dermatologie-chamonix.com/userfiles/file/vazur.pdfIn PDF document text
- https://stpm-sa.com/userfiles/file/96633606050.pdfIn PDF document text
- https://francoisdaulte.com/ckfinder/userfiles/files/viloxifikag.pdfIn PDF document text
- https://minhvuongthuphap.com/upload/ck/files/14211461003.pdfIn PDF document text
- https://wrd13.com/force/file/18700887291.pdfIn PDF document text
- https://www.sistemkabin.com/ckfinder/userfiles/files/36644424805.pdfIn PDF document text
- http://savitaco.com/uploads/images/files/70274111649.pdfIn PDF document text
- http://gyogytornasziget.hu/uploads/files/26317319874.pdfIn PDF document text
- http://gzcaifeilai.com/ckfinder/userfiles/files/202109081556036268.pdfIn PDF document text
- http://charivne.info/images/file/kuwadoferomeruveraxakup.pdfIn PDF document text
- http://oldmotorsclub.com/files/file/55472269311.pdfIn PDF document text
- https://millvalley.com/wysiwygfiles/file/dovefezazawipetibadow.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+free+money+on+bloxburg+without+workingPDF 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_off0000ff59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF59	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011770.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11770	10956 bytes
SHA-256: `0e61ff06d08435615bcef9be73036bac4a8b7e2c63b24e66f1087980400ff781`
`font_02_sfnt_off000130a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130A3	18484 bytes
SHA-256: `19a4930a389f9fcb92be21d395811163b87d1ee41ebd8d1d47a5c9eeed1cb997`

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