PDF malware analysis — malicious · bd36a7de46c1e5bf

MALICIOUS

PDF

82.7 KB Created: 2021-06-11 22:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 1dff5c6c8c16e2f367f8bcb63d058b19 SHA-1: 8a5718cafd808b02d73ccdc9db46f0448adb2809 SHA-256: bd36a7de46c1e5bfe036833bd9da62952d5654365ab95c6dce39a1ba7d2a0c41

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many hosted on disposable domains, suggesting a phishing or ad-revenue generation scheme. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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.
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://medvor.ru/pbw?utm_term=coordinate+geometry+pdf PDF link annotation
- https://dikubone.weebly.com/uploads/1/3/4/6/134603537/dosuvojaso.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4422137/normal_5ff30daf4899a.pdfIn PDF document text
- https://tasoxagizuj.weebly.com/uploads/1/3/4/7/134734804/zejijuj-fawaxaluxun.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4366959/normal_5ff7db73ee17e.pdfIn PDF document text
- https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/murumab.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4457320/normal_606b8f506e1aa.pdfIn PDF document text
- https://gebusoju.weebly.com/uploads/1/3/0/9/130969184/2111986.pdfIn PDF document text
- https://wanezevidika.weebly.com/uploads/1/3/4/5/134588498/toridiwepope-sufukuzafuvujaj-jofuzorowam-walekawaxusat.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4481520/normal_5fcfee9aaf3df.pdfIn PDF document text
- https://xeluxujuw.weebly.com/uploads/1/3/4/4/134438775/9323843.pdfIn PDF document text
- https://kubududowu.weebly.com/uploads/1/3/5/3/135349078/vupaza.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://jajisaparev.pbworks.com/w/file/fetch/144420258/cif_volleyball_score_sheet_instructions.pdfIn PDF document text
- http://depowota.pbworks.com/f/49329937086.pdfIn PDF document text
- http://fixulirulafa.pbworks.com/w/file/fetch/144515988/homojen_karma_rnekler.pdfIn PDF document text
- http://wuranosa.pbworks.com/w/file/fetch/145014711/ppsspp_gta_iso_file_download.pdfIn PDF document text
- http://raravisu.pbworks.com/f/how_much_are_1990_skybox_basketball_cards_worth.pdfIn PDF document text
- http://vogivakazela.pbworks.com/w/file/fetch/145090200/16313752596.pdfIn PDF document text
- http://fenetikuro.pbworks.com/f/roshambo_paper_mario_color_splash.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://scripts.sil.org/OFLIn 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_off0000ef78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF78	5156 bytes
SHA-256: `288def72acd225e7f6a1c2a1eda06c5ddd3a3b586a7a822624d6c8b2b981b5ad`
`font_01_sfnt_off000100f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100F8	11260 bytes
SHA-256: `4a842447b11a33cc1d5391839ff1fb0f2c1355c7c0fe125faf7f72e49f5386b4`
`font_02_sfnt_off0001277d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1277D	16320 bytes
SHA-256: `4af0faea6eb629d991b0b09b8ad9817c499102a4b91cfe91590b86f2b1e1610d`

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