PDF malware analysis — malicious · 7c39581a8de5c5ac

MALICIOUS

PDF

71.7 KB Created: 2021-01-02 07:34:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14

MD5: 177cc3cf8b4e7745964364aa58a7e4e9 SHA-1: 2f9fcbce8b279ee36e2adf4d3f945773c8dbb84f SHA-256: 7c39581a8de5c5ac5bbbf96fbc2200a51bda2fb09b222152c0a4caf51df45afe

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains text that appears to be a lure related to academic writing, suggesting a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 4

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://traffine.ru/123?utm_term=conectores+para+hacer+un+ensayo+en+ingles PDF link annotation
- https://cdn.sqhk.co/tezakagadol/iedNHgg/73583716073.pdfIn PDF document text
- https://cdn.sqhk.co/pimidima/VtiLPDy/dining_table_and_chairs_walmart.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387816/normal_5fb6420bcc6ea.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4425759/normal_5fdb88cf198cd.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4471995/normal_5fcb0d751f5a3.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/divelatoxa/sumun.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5b86488a-0ffe-4dcf-a017-c0933e8411b8/9357427032.pdfIn PDF document text
- https://s3.amazonaws.com/wolina/53835397799.pdfIn PDF document text
- https://s3.amazonaws.com/zedilegol/mdc_dependent_verification_worksheet.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4305d7ae-66ac-4d5b-b78b-bd57d33a38a9/construction_project_manager_jobs_memphis_tn.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000da57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA57	5204 bytes
SHA-256: `29764a847d9b650f64858e2640ca3baa39852461a2e35c42c77b670fd3547748`
`font_01_sfnt_off0000ec0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC0C	11208 bytes
SHA-256: `4ead06b2c9e604cf7aeb4f6897384d828bb80902cf784ab303262fe7c94d37bc`

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