PDF malware analysis — malicious · f4a73e99c615c8c0

MALICIOUS

PDF

77.9 KB Created: 2021-05-28 15:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 86e13348c5586d4a62a1fb157a69ba45 SHA-1: f018e85f1ba2456d8c8c448c8557fcb894893349 SHA-256: f4a73e99c615c8c020f50a6e85532a59b762353abc4e38a509b39b6066b3c913

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for SEO spam or phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely involving a phishing lure or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://druttle.ru/strik?utm_term=how+to+make+exclamatory+sentences PDF link annotation
- https://dawikuwavuvuka.weebly.com/uploads/1/3/4/8/134866752/lusekavunijedin-wixivekemew-sadewafizanelid-vonebuv.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4466413/normal_6059612644bf4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369173/normal_60219d6c1a5ed.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4472793/normal_606699993b2a1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4486566/normal_5fdbf2c68a14a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4450747/normal_60450317df3e7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4492588/normal_6024b5c0696ce.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383147/normal_602af2d308db9.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4376870/normal_5fe0dac0099d6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403824/normal_603451ea1d2ba.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4474980/normal_60b09993d35f2.pdfIn PDF document text
- https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/kijekemiwugelimam.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4377663/normal_60265ae202ad3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476782/normal_601b97c9dba09.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4386337/normal_605f732db3bfe.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446790/normal_6037168cef5e4.pdfIn PDF document text
- https://zefowuji.weebly.com/uploads/1/3/4/0/134096403/fituxininuzotut.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4483081/normal_6017f7dfe4c81.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4491153/normal_600e50d926b47.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4490724/normal_6021eeff5e113.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4419640/normal_5fe0c1ba701ce.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4485576/normal_5fef0a65ad4bf.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4461767/normal_5fdd7f452d5cb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403952/normal_602ddbc6b822a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4450907/normal_5fd175760085d.pdfIn PDF document text
- https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/8897981.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4427080/normal_6065830f6651f.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f143.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF143	5232 bytes
SHA-256: `c6e63fa9d8699602c1171d008c89e891a46f75f9650943f36e15b6dedc8d7de2`
`font_01_sfnt_off0001030b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1030B	10852 bytes
SHA-256: `d65987f6761de25ae0b9b41b1d74cbd568fffd3653c8f832e0e91b4cf4258905`

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