PDF malware analysis — malicious · d4f80ef5a788e9e6

MALICIOUS

PDF

78.2 KB Created: 2021-06-06 00:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 6fda136631e91f497fa3c01cdb30e0e1 SHA-1: deba7803b84f2996d747236319bc2bef856506f2 SHA-256: d4f80ef5a788e9e61273481c9e52fc90a0921c2a007301a4f8a6631d3a3c7dc5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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
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.
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/pbw?utm_term=how+do+you+find+the+volume+of+cubes+and+cuboids PDF link annotation
- https://cdn-cms.f-static.net/uploads/4446782/normal_6063c78d5b46c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4451563/normal_6064a6e04b8f3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4378599/normal_606b6f5b20af0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4424378/normal_6055b136ede4d.pdfIn PDF document text
- https://vogexuweju.weebly.com/uploads/1/3/0/9/130969932/aa119b307c3d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4392474/normal_605fba02b9d05.pdfIn PDF document text
- https://zoxobafibo.weebly.com/uploads/1/3/4/2/134235835/fezufuzi_fagusugejomifux_kilanetimubukon_movodej.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4486982/normal_6064c94cdd6b3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403952/normal_5fd9323b634a0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4464707/normal_606d951209140.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4504870/normal_5fe63c1412f45.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://uploads.strikinglycdn.com/files/98685fa9-5bb4-4549-9efb-eabba79e8d90/appreciate_the_history_of_art_in_the_philippines.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1ffa6383-750e-4f34-9c2c-9ca15de90322/mejores_cremas_para_piel_acneica.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f38dec20-6f7b-4e1f-ae0c-821044616d2d/moxokewik.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c58e847d-fe48-4979-ab76-d40a801a880f/how_to_replace_pull_cord_on_troy_bilt_edger.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/535395fd-01e7-46fc-987d-4adc558638cf/belkin_netcam_installation.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/740931a5-558d-474f-beba-76b7ca8ee5b0/how_to_setup_wireless_turtle_beaches_on_xbox_one.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/51fee430-97ae-4dcd-8c40-25b4b6c2a00d/magezikavibimukob.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a13e34a7-4448-4272-8460-c6b2ee2a118f/evaluating_algebraic_expressions_worksheet_answers.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/afafa398-2f31-40de-a5f1-e78147076b55/hamlet_william_shakespeare_movie.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e491.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE491	5400 bytes
SHA-256: `b313738888cd1bc62f5e6f18ea22b3ea23bf76c1552b1c5697bd2c34bb1d2c8a`
`font_01_sfnt_off0000f6db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6DB	11276 bytes
SHA-256: `fdc225e1e53ce92784a1c3f1ff98a15e60d2ff9e99fbb2b5b5378adedb7458ed`
`font_02_sfnt_off00011d75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D75	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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