PDF malware analysis — malicious · 09430ec67885404a

MALICIOUS

PDF

89.0 KB Created: 2021-03-24 16:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: 973003ab32ab14d8f12a41c48ed3c179 SHA-1: 686c5911a825470f9e850a614d3c4cbd36d3182f SHA-256: 09430ec67885404af50746fef2b3875025560c4810d37e08185fead6a41c5e7f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

Heuristics 5

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 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://golowaki.ru/award?keyword=agrobacterium+ti+plasmid+pdf PDF link annotation
- https://cdn.sqhk.co/mogizilo/Whi630f/vebigirifixinog.pdfIn PDF document text
- https://cdn.sqhk.co/kukelagalefe/jbgd6xL/81603032754.pdfIn PDF document text
- https://cdn.sqhk.co/fefavezevir/Tigiaij/34887065482.pdfIn PDF document text
- https://cdn.sqhk.co/vikojovowoso/NghhacT/weather_station_fortnite_battle_royale.pdfIn PDF document text
- https://cdn.sqhk.co/vakanaju/iWQhejj/lefuwiba.pdfIn PDF document text
- http://zathkatow.xyz/wonumatagemoxiv49pe8.pdfIn PDF document text
- http://marketitaly.info/nonajistso1.pdfIn PDF document text
- http://gallery-shop.site/brown_vs_board_of_education_lower_court_decision42dw0.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://s3.amazonaws.com/kodipopujufipig/69713043727.pdfIn PDF document text
- https://s3.amazonaws.com/wuwabobujasivor/bapuj.pdfIn PDF document text
- https://s3.amazonaws.com/jazamerijekufol/nojemomesuzejinupufesi.pdfIn PDF document text
- https://s3.amazonaws.com/daxemo/39455942107.pdfIn PDF document text
- https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_bd31de0da46549c9887433ad7accf818.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/tinezedu/49132959834.pdfIn PDF document text
- https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_e5eede94395f4013a34086ddec3cce76.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/jajuzasalikirut/29770684926.pdfIn PDF document text
- https://s3.amazonaws.com/lixisariwulo/l_algorithme_informatique_exercices_corrigs.pdfIn PDF document text
- https://s3.amazonaws.com/dugibabafod/color_by_number_worksheet_1st_grade.pdfIn PDF document text
- https://s3.amazonaws.com/muvojugejoxip/58693818471.pdfIn PDF document text
- https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_b5befeec9b1f4cf8b3e23fffdb9090bc.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/gewisetug/56028784607.pdfIn PDF document text
- https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_f3002c84a8684bdf9383fc27e949a2fa.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/sesafefanulokam/faruvunukuwunalerulogove.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fba4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBA4	5380 bytes
SHA-256: `552d6eab183f297b9c27e1088678ceb49b3cd1673fc87ef41e96abee25e7a4dd`
`font_01_sfnt_off00010de9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DE9	10736 bytes
SHA-256: `d1f511a7a9ad3682d4bb167c6415442e273e1dd7ac757ab9c8d14777c4011168`
`font_02_sfnt_off000132fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132FA	16148 bytes
SHA-256: `43dd7310e986e37c0562d6efd2a67b6291a0d41fa892ecd43b306c3e7231f7b7`
`font_03_sfnt_off000147f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x147F1	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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