PDF malware analysis — malicious · c4c27039871f6fc9

MALICIOUS

PDF

84.1 KB Created: 2021-05-31 00:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25

MD5: b534c50a8f8a7c87b1a3b8e8035ce0de SHA-1: 419509068086dbacdcdc45401189729b86ce67ba SHA-256: c4c27039871f6fc9d9bfd5c6ff7c687fd68308f4cf8603da21fa57d280c10a0a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the structure and numerous URLs point towards a malicious intent to deliver a payload or phish credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 6

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://pelibifir.ru/strik?utm_term=free+backing+tracks+for+tenor+saxophone PDF link annotation
- https://cdn-cms.f-static.net/uploads/4465128/normal_603c13f4bc259.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426679/normal_603f66164c3a6.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4500677/normal_5fdf173d725bd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449421/normal_601a07875581f.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4415748/normal_5ff01c7646457.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387244/normal_6051afe1ea0ab.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417807/normal_602285dc80a51.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4377933/normal_5ffc931e8759a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446388/normal_6024cb0a19f18.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366339/normal_604e085d39b31.pdfIn PDF document text
- https://xamuzufoka.weebly.com/uploads/1/3/4/8/134893590/jasodiseb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4450257/normal_604930393e163.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4424400/normal_601eac183b757.pdfIn PDF document text
- https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/gabufosupegum-raxonulaxorig-penavufitiwale.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369645/normal_60286902025a7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369764/normal_60102e1098b47.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4427523/normal_6051ab5d632df.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415524/normal_6020ca876f21e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4417808/normal_5fe3a24ccd91e.pdfIn PDF document text
- https://wetebaxa.weebly.com/uploads/1/3/4/3/134343617/2947640.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4462974/normal_602ec64e9daa2.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4478687/normal_5fcbf545938c2.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f3cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3CF	5472 bytes
SHA-256: `188e4a8378d4de1ab047358889230d7a25a3f7c1b829b351968d61471d0bb8f0`
`font_01_sfnt_off00010671.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10671	11376 bytes
SHA-256: `63a6477fedf2896d0243656821cdf7ebfc534c8091457832bb3b143d289cac63`
`font_02_sfnt_off00012d39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D39	16096 bytes
SHA-256: `3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca`

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