PDF malware analysis — malicious · d16e450831b2040f

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 22:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: c420f99cb4d6e6ddacf8eb948237abf2 SHA-1: ccc73d89a530a00f16b2cf6237f917897eef9f48 SHA-256: d16e450831b2040f92ab5a1c59b64974c95bfa27533802051c35048e19818c6a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicates it is a link farm designed to redirect users to download further content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload. The presence of JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

Nyx PDF Classifier malicious score 0.9950

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://golfvillageonline.com/userfiles/file/71025245245.pdf In PDF document text
- https://praktijkbinnenstad.nl/file/zomoxu.pdfIn PDF document text
- http://bradzo-ep.com/uploads/files/28597535916.pdfIn PDF document text
- http://tingchucontrol.com/Uploadfiles/files/sowolefetaleluwavamepe.pdfIn PDF document text
- http://kajo-frings.de/userfiles/file/xujifuvelubel.pdfIn PDF document text
- http://www.musicboxpiano.com/contentfiles/50556091769.pdfIn PDF document text
- http://newworldss.com/uploads/file/84976547920.pdfIn PDF document text
- http://systempro.kr/userData/board/file/batunupulon.pdfIn PDF document text
- http://becskeicsodajo.hu/admin/fck_upload/file/69261942681.pdfIn PDF document text
- https://ruta.hu/ckfinder/userfiles/files/guriniwadisisaxima.pdfIn PDF document text
- https://berettyotv.hu/userfiles/files/52764038405.pdfIn PDF document text
- http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/pumefaromenuv.pdfIn PDF document text
- http://yuhenganquan.com/userfiles/file/20210904092153_1610157534.pdfIn PDF document text
- http://zonazero.es/userfiles/file/bisabujowimi.pdfIn PDF document text
- http://worldplastsolution.com/ckfinder/userfiles/files/21130006920.pdfIn PDF document text
- http://schokofontaenen.de/idata/gumabokega.pdfIn PDF document text
- http://rc-modeller.se/images/file///nexegil.pdfIn PDF document text
- http://group-anons.ru/userfiles/files/vetuf.pdfIn PDF document text
- http://csc0731.com/userfiles/file/20211003021523_69x0gj.pdfIn PDF document text
- http://cellfruits.com/ckfinder/userfiles/files/19926988051.pdfIn PDF document text
- http://tt-ural.su/admin/ckfinder/userfiles/files/10482533880.pdfIn PDF document text
- http://presssimayeshahr.ir/pic/file/bezufadewuxamarifuromelon.pdfIn PDF document text
- http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/pegapokaropa.pdfIn PDF document text
- http://sabaispa.net/userfiles/file/rujagevolu.pdfIn PDF document text
- http://beta-rc.com/upload/files/gekejurexumo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=becoming+bulletproof+evy+poumpouras+pdf+free+downloadPDF 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_off0000b09a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB09A	16284 bytes
SHA-256: `4d6787b89394abb271fc04bc693865ac0cb6e7921a85eb13a9b583daa614ea8b`
`font_01_sfnt_off0000da42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA42	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f259.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF259	11520 bytes
SHA-256: `74dbe174b3e58edf360598fa8d8afd3a0cb8eb2137658ca7cadc22f9f64c5642`

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