PDF malware analysis — malicious · 1696a031dbcdfbf8

MALICIOUS

PDF

81.3 KB Created: 2021-05-27 20:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02

MD5: ab6c20b35e492d6d7f1dd8c8c69ea36c SHA-1: a81769f9202cc9e8260f41fedfc127e9b842cc43 SHA-256: 1696a031dbcdfbf8c16baac97ca43cbf3af667d070795ff7ea1c899ef8effdef

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic indicating a mass external PDF link farm, with one prominent URL being 'https://jumiwimov.ru/wb?keyword=business%20mathematics%20book%20grade%2011'. This URL is presented in a way that suggests a search result, aiming to trick users into clicking. ClamAV detection and ML classification strongly indicate maliciousness, specifically as a phishing or trojan PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 5

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.
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://jumiwimov.ru/wb?keyword=business%20mathematics%20book%20grade%2011 PDF link annotation
- https://cdn-cms.f-static.net/uploads/4370089/normal_6051606835761.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4482617/normal_605477d84aef4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4420906/normal_5fd776487174d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4491670/normal_603a5e129d0c6.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4402722/normal_5feb6cd678f56.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4468836/normal_602b299e27aad.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4390097/normal_605ef39191115.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4424666/normal_6003e568f0e06.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4406777/normal_60287726dff1c.pdfIn PDF document text
- https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/banugozaponikomafak.pdfIn PDF document text
- https://kewalagaxed.weebly.com/uploads/1/3/4/8/134864879/6767333.pdfIn PDF document text
- https://sakeneri.weebly.com/uploads/1/3/4/3/134339958/botilujobepabu-tosufaxir-kamibowofol-zojepixeju.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4414173/normal_5ff1c915dcab0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413002/normal_5fdb57eb3e31f.pdfIn PDF document text
- https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/retelatewigazubut.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4407062/normal_5fe796b82997d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4416928/normal_60552a06afcf6.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/d77beb94-77c1-4ba5-acaf-ca5a8faa3daf/63888561825.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/48a17931-2c7c-4871-a77c-2e8f04f275ad/how_to_use_avalon_humidifier.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/49116072-6c38-4eac-a3dc-5be1e12a3f2e/does_samsung_ks8000_support_hdr10.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/eab64f3c-8c43-4380-a704-c89511f81c48/club_car_service_manual.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9a678c7e-acef-4c31-8519-e96c0843a6d7/what_are_popular_methods_used_in_performance_appraisals.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5be563de-6d71-4ae4-91f9-571bb44ce3b6/57452903888.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/360447d0-b1d2-4a7b-b570-53ed7f6a191d/65097442694.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ac23873e-4711-4ef6-a0ea-22dcc155e8ea/electrical_engineering_project_report_sample.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_off0000fc13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC13	5624 bytes
SHA-256: `e6347fe321a59ff947165ed451a95db15a3b65c3bd47a90d243b8b1ce21ce6b8`
`font_01_sfnt_off00010f09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F09	11836 bytes
SHA-256: `c2f8119dc83e8af00f6a3c720a075ffc48489141e513b1330cbc1f6c0293ce39`

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