PDF malware analysis — malicious · 1c3d267c9574f0c6

MALICIOUS

PDF

68.7 KB Created: 2021-05-28 22:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 3c9ace9fcdba4a65b7518c9eb96b6f5c SHA-1: 7f5281e95572258663c6243bc9155b6e9c883601 SHA-256: 1c3d267c9574f0c6f2326dac6c13a18cb78757c91a7ffc2fab6f90f650eac4d4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs, 'https://soxebez.ru/strik?utm_term=cumulative+test+12a+answers+algebra+1', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution, by directing users to potentially harmful external content.

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://soxebez.ru/strik?utm_term=cumulative+test+12a+answers+algebra+1 PDF link annotation
- https://miremawa.weebly.com/uploads/1/3/4/6/134631892/xezotobekeviwuwufalu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469643/normal_6050e4283a1c9.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4387815/normal_5ff2095f86bfa.pdfIn PDF document text
- https://vusiwofadenu.weebly.com/uploads/1/3/4/2/134265349/349891.pdfIn PDF document text
- https://dewajijivixire.weebly.com/uploads/1/3/4/6/134638152/cff819f484.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4443341/normal_605896a7c63a1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4382639/normal_60314bb8a7268.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4443337/normal_6056a6ce2c150.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379964/normal_601aa91249d02.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4427809/normal_602e8426c4a11.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447433/normal_6034a038b8e13.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4421477/normal_5fe8b7c379f5d.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/9a0514f4-886c-4ba7-99f8-f00ef3b4a9eb/75594612758.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d2894783-6e8e-42fe-a752-58fcf9e00f82/34524315946.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a6e82274-0c64-4bf6-a71a-d2af142912b1/what_techniques_are_used_to_gather_data.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5a8f4ca7-6640-4858-bc71-cf40a3fdd5bb/32655449136.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/12a68cdd-6fe4-46ee-8621-7a985d8cf2e1/dalibuzatopulatoxefoduv.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4327a5f0-0825-46c0-9d6a-fdb48cb53259/45356338161.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/37e4ccd9-b0bd-4b9f-ab96-b0609e8cd8e7/star_trek_movies_with_chris_pine_in_order.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ca8d2ba9-8be1-4998-9842-28e9093f1f3f/libro_el_ser_y_la_nada_jean_paul_sartre.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_off0000d0a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0A5	5388 bytes
SHA-256: `0d065218f2b0d6a0b85d29332e7bb2729985dfe66d87ded5e61f197383a21a3e`
`font_01_sfnt_off0000e2fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2FC	10156 bytes
SHA-256: `64b2ce7db27cae79bebb4052de89b77b82eea7bb91e3f5e122778ed5a200a982`

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