PDF malware analysis — malicious · 2b1e7aae189d6df1

MALICIOUS

PDF

72.5 KB Created: 2021-10-02 10:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 91d5346525872eb59edae00dc891dfaa SHA-1: 0abb419d066be797b410d8d1de00735f3d83ab2c SHA-256: 2b1e7aae189d6df16fb44a40fdf756ec8ede66b8e87bafdab8bce2e58a4dc0e0

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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
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://theseadiaries.com/ckfinder/userfiles/files/zijuwugotoxozelidin.pdf In PDF document text
- http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34648678408.pdfIn PDF document text
- https://lmcmanager.com/ckfinder/userfiles/files/wutazine.pdfIn PDF document text
- http://orthodoxvaidikasanghom.org/userfiles/file/8270573120.pdfIn PDF document text
- http://ideviceplus.be/app/webroot/files/userfiles/files/vikumimaranudotuwodaduvo.pdfIn PDF document text
- http://pc580.cn/upload_fck/file/2021-9-19/20210919045729781664.pdfIn PDF document text
- http://arucax.am/user_images/file/40473833311.pdfIn PDF document text
- http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/gulijakilovedufemezi.pdfIn PDF document text
- http://catwalkexotique.com/userfiles/31675404335.pdfIn PDF document text
- http://needychild.org/ckfinder/userfiles/files/36564910269.pdfIn PDF document text
- http://toyteepee.com/uploadfiles/file/210913235243774968lf3tge.pdfIn PDF document text
- http://warmistore.com/userfiles/file/14200779440.pdfIn PDF document text
- http://hrudolf.com/userfiles/lidigonevoweb.pdfIn PDF document text
- https://abicecream.ru/ckfinder/userfiles/files/supowobilemolalexefo.pdfIn PDF document text
- http://eegbiofeedback-leszno.pl/userfiles/file/55174166180.pdfIn PDF document text
- https://behbehaniprojects.com/uploads/files/fekifeminidekorikijuzajo.pdfIn PDF document text
- https://landtop.com/filespath/files/20210909165427.pdfIn PDF document text
- http://motolargo.pl/userfiles/file/banolaresigufu.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153165293546---toxedeferafofosug.pdfIn PDF document text
- http://dianacb.cz/userfiles/file/nasavepiwabunoja.pdfIn PDF document text
- http://glassick.com/userfiles/file/25386956927.pdfIn PDF document text
- http://www.nagsa.es/ckfinder/userfiles/files/xewafadowal.pdfIn PDF document text
- http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe7f3bbac---xulusotasibomu.pdfIn PDF document text
- http://philboyd.com/sapunemusibirejine.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=burke+reading+interviewPDF 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_off0000b2f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB2F7	10484 bytes
SHA-256: `3a3888a39049bb6e2b7e0a32f868e8139dd6b778d327f392066f4adae3a54ddb`
`font_01_sfnt_off0000cac1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAC1	19552 bytes
SHA-256: `43b3f2a56f67e3a71f53266c0d0140cc6ae3631ae5d5d51c4dd851ea6c56486c`
`font_02_sfnt_off0000fc83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC83	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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