PDF malware analysis — malicious · b99c61433ed2e892

MALICIOUS

PDF

397.7 KB Created: 2021-04-07 04:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: f9bb3adbd3ec76500ee7869642524465 SHA-1: 8e984cac11fb30ff0ce11a63ec540aa3a3f91305 SHA-256: b99c61433ed2e892c4dcf96370fc099eb40da5fd31b2cc316414a77fb16508e3

136 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a high-severity 'PDF_SEO_UTM_REDIRECTOR_LINK' and a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URL 'https://jottigo.ru/123?utm_term=speaker+boost+application' is identified as a redirector, suggesting a phishing or malware delivery attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.8676

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK

PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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://jottigo.ru/123?utm_term=speaker+boost+application PDF link annotation
- https://cdn-cms.f-static.net/uploads/4426677/normal_603a7d5ba30a0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370985/normal_5fd8ba7d6360d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4501634/normal_6001e1522755e.pdfIn PDF document text
- https://cdn.sqhk.co/xizefonuma/y0BigjU/sonic_boom_show_cast.pdfIn PDF document text
- https://cdn.sqhk.co/bidogefapo/fVSC98K/rabunotagi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475854/normal_6031dccec16de.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4411921/normal_5fdc93ee0d409.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4443801/normal_5fd6cd76415b2.pdfIn PDF document text
- https://cdn.sqhk.co/modonasuje/eidhbmQ/vogefakamagoxukumalesu.pdfIn PDF document text
- https://cdn.sqhk.co/besiwowegin/igYgemO/forbes_magazine_customer_service.pdfIn PDF document text
- https://cdn.sqhk.co/devurekon/nQhjmje/58726875275.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368224/normal_60032c5acb9ce.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4487902/normal_5ffd48b66dbad.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/senodiw/nice_guidelines_hypertrophic_cardiomyopathy.pdfIn PDF document text
- https://s3.amazonaws.com/nalifij/homophones_worksheets_grade_3.pdfIn PDF document text
- https://s3.amazonaws.com/tojazudibumogab/71266748921.pdfIn PDF document text
- https://s3.amazonaws.com/gujutavevive/89185372220.pdfIn PDF document text
- https://s3.amazonaws.com/sefukirexuwekij/mebefogojedele.pdfIn PDF document text
- https://s3.amazonaws.com/fezenur/best_roku_model_2020.pdfIn PDF document text
- https://s3.amazonaws.com/donake/sezerixojazonaxaxujuk.pdfIn PDF document text
- https://s3.amazonaws.com/tibitexil/bristlecone_pine_information.pdfIn PDF document text
- https://s3.amazonaws.com/buponuwebi/51077835700.pdfIn PDF document text
- https://s3.amazonaws.com/zerepuzuze/1372710175.pdfIn PDF document text
- https://s3.amazonaws.com/nitajosasa/silk_bedsheets_online_india.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_off0005cec6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5CEC6	5236 bytes
SHA-256: `4bdd3b191e8a326f3cc1a3615dc8835e0c1d546fdda194d08ffe989d78247fbf`
`font_01_sfnt_off0005e0a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5E0A3	13772 bytes
SHA-256: `57db9d452d4bec106b5dea58e6b1ba0c53b1789d1ea9d5097501621f1515a885`
`font_02_sfnt_off00060e50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x60E50	16752 bytes
SHA-256: `4ce524145b3dce8fe9ff147c1b2aab3da9c0c4ec2c07cc378771c33728cf9a90`

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