PDF malware analysis — malicious · e1f69aa3f20b5400

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 06:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 662f25b364bcaf4a29b9bfdc1b20d677 SHA-1: 0d239bb75302b2113949e1291bf214c9b57e5d09 SHA-256: e1f69aa3f20b540084ef0bdc98d65e09ac86c6582fe0ca1f234c47c14b4f83f6

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URLs, many pointing to disposable domains and exhibiting link farm characteristics, suggests a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=positive+words+that+starts+with+r PDF link annotation
- http://avsa.org/sites/default/files/images/files/87301654438.pdfIn PDF document text
- https://produse-zilan.ro/files/xevebibekoxobebasubudo.pdfIn PDF document text
- https://sitpchemcieszyn.pl/_sitpchem/file/72283906958.pdfIn PDF document text
- https://vinniescustoms.com/userfiles/files/vibegojeboninagi.pdfIn PDF document text
- https://marblo.com/app/webroot/img/files/88091613846.pdfIn PDF document text
- http://ancheng-medical.com/uploadfile/files/duwukikuruwogipukos.pdfIn PDF document text
- https://kurashi-kyoiku.com/cms/dat/upimg/file/lanewin.pdfIn PDF document text
- https://ismart99.net/upload/files/16017922229.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161469dc5c66d6---juxoxelegavupunil.pdfIn PDF document text
- https://gionggiacam.com/ckfinder/userfiles/files/xijeka.pdfIn PDF document text
- https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/dejebak.pdfIn PDF document text
- http://professional-tuner.at/uploaded/file/98989763734.pdfIn PDF document text
- http://nacyc.jp/Upload/file/56421517755.pdfIn PDF document text
- http://dolphinkorea.com/files/files/pivegumasolidemutixutuw.pdfIn PDF document text
- http://abbeytraining.net/userfiles/file/85275113464.pdfIn PDF document text
- https://artistaone.co/userfiles/files/dafuveloxipuzid.pdfIn PDF document text
- https://sunarchegypt.com/userfiles/file/jebofazefesorarutavix.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/kaputejelukidevow.pdfIn PDF document text
- http://qbcar.ru/ckfinder/userfiles/files/koxobusirazaguwemazuxakem.pdfIn PDF document text
- http://lindendirect.com/tempimg/file/47327777993.pdfIn PDF document text
- http://altaprecision.com/userfiles/file/49997494833.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143068bdf29f---15143566141.pdfIn PDF document text
- http://maturitni-ples.eu/UserFiles/File/kutakametetimoja.pdfIn PDF document text
- https://wsbtitan.com/images/file/tipogud.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_off0000d48b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD48B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ec9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC9D	17356 bytes
SHA-256: `ed4403cd1d0c7203d639678988d90edeef9d8b9768ca3adafdd24ef571ea7b95`
`font_02_sfnt_off000119a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119A6	10348 bytes
SHA-256: `0a21d702bc658e27c2fef376a13c572f67925d7844f7676bc9d269bf01061a3c`

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