PDF malware analysis — malicious · 6626ab40c0a9eecc

MALICIOUS

PDF

81.5 KB Created: 2021-06-02 14:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10

MD5: c01cfe17f5f406f2d0f1873a64b3c553 SHA-1: 4117a0238a899d51814caa0e74d03033381da7fe SHA-256: 6626ab40c0a9eecc2a9adc7e6469bb825b4a5877333099caf28f19c43013afcf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious activity appears to be directing users to external URLs, one of which is `https://cructi.ru/pbw?utm_term=ms+c+class+pipe+thickness`. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest potential for embedded malicious JavaScript or exploitation of PDF vulnerabilities to redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/pbw?utm_term=ms+c+class+pipe+thickness PDF link annotation
- https://cdn-cms.f-static.net/uploads/4506063/normal_600c4c573189c.pdfIn PDF document text
- https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/9463091.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4416506/normal_602cfecabaeb1.pdfIn PDF document text
- https://tebozelekunoton.weebly.com/uploads/1/3/1/4/131453588/10cdcc4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4501054/normal_5fd2c42fba865.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4466391/normal_601c8593cc467.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4404313/normal_5ff9491487df1.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4495050/normal_60037ba4ebb4f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469640/normal_5fe9d221425ac.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4414161/normal_606cf6f7cccf6.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4414502/normal_5fe567b4bef73.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380883/normal_60223a5299480.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366395/normal_60237f9feaf64.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379489/normal_601449ba04bda.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4449616/normal_5fc7d24d17cee.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4410983/normal_5ffb4e70a9c37.pdfIn PDF document text
- https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/zitetanubuzov_pinumiti.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408479/normal_6047ba9452dc9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4402252/normal_602f510d89497.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4450347/normal_601c8cf0801be.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4405674/normal_603c04918742b.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/6f133aa5-be22-47b9-8b70-2be770f3093a/2007_chevy_impalas_ss_front_wheel_drive.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6d435dbf-7c1a-4cfa-8174-751e7a5e93e4/how_to_write_summary_for_resume_for_freshers.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_off0000f3f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3F3	3776 bytes
SHA-256: `c64d2b86262c4192df7a8c2f7808862577df3ea436b42ed054a1c067de8c6f63`
`font_01_sfnt_off00010141.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10141	4992 bytes
SHA-256: `e51dae9e34bd2a91ef483768c7422a53d627337838e902b11b6fe464d5afbf04`
`font_02_sfnt_off00011248.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11248	11172 bytes
SHA-256: `150b132efc17ee8be117eae79438d76733b9c8d6e1c9aa9958841ecb45fb34f3`

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