PDF malware analysis — malicious · aa1b64fbad41a342

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 07:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 0c02ba9a690505358094d8eb1c1708c0 SHA-1: 1e989d78e36efe72b764d0e29501483fdbd47a45 SHA-256: aa1b64fbad41a342614ac8abd01145a377b657491b8a47fd3e9301a96bc8d319

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs, including one pointing to 'nomylo.ru' with a 'utm_term' parameter suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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 https://nomylo.ru/uplcv?utm_term=illegal+websites+to+watch+tv+shows PDF link annotation
- http://goang-hann.com/uploads/files/202109131819092901.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16146417507cdc---70507267786.pdfIn PDF document text
- http://www.tiande-global.com/ckfinder/userfiles/files/72054797406.pdfIn PDF document text
- http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/vikuvasotaxe.pdfIn PDF document text
- http://thietbinuoitom.vn/uploads/userfiles/file/12337731302.pdfIn PDF document text
- http://pusheng168.com/uploadfiles/20210904072225.pdfIn PDF document text
- https://eric-parnes.shortex.com/ckfinder/userfiles/files/85165398606.pdfIn PDF document text
- http://cafegreenwichvillage.com/uploads/files/78574676234.pdfIn PDF document text
- http://xaydungphongphu.com/uploads/files/52914536621.pdfIn PDF document text
- http://wohingltd.com/userfiles/nagizivoru.pdfIn PDF document text
- http://cablexconsulting.com/Upload/file/94698846782.pdfIn PDF document text
- https://onthespothousing.com/userfiles/file/89676882032.pdfIn PDF document text
- http://hum-lucknow.org/test/fckeditor/file/rolomibanap.pdfIn PDF document text
- http://k3projekt.pl/uploads/userfiles/files/78716122996.pdfIn PDF document text
- http://tpokebar.com/uploads/files/71519000242.pdfIn PDF document text
- https://vietnam-pump.com/userfiles/file/nomobibejavunolajuwulefaw.pdfIn PDF document text
- http://titibbs.xyz/js/ckfinder/userfiles/files/lanitawinojenabujesupidi.pdfIn PDF document text
- https://seedcambodia.org/htdocs/cljr/data/files/69494808421.pdfIn PDF document text
- https://olterus.com/contents/files/motovudoniv.pdfIn PDF document text
- http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/54878956811.pdfIn PDF document text
- http://thainightjob.com/ckfinder/userfiles/files/94444872107.pdfIn PDF document text
- http://studioriggio.it/userfiles/files/86669333056.pdfIn PDF document text
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ca7e9fb26d2838bd27d81512327ec567/duwezukoruvusevuxikedivuw.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_off0000cedd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEDD	17400 bytes
SHA-256: `b6443f11ca805ab6c6a0346b9f0f2076c76fb209de4f8b7d0a4077554e002fe8`
`font_01_sfnt_off0000fbd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBD4	10548 bytes
SHA-256: `661a10f11cffdc7bc7a6a2aa48cd56e7865c13087c6d7fef229d04c09e2b3d2a`
`font_02_sfnt_off0001141b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1141B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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