PDF malware analysis — malicious · 7e9c5e9b43b93a86

MALICIOUS

PDF

78.6 KB Created: 2021-04-30 18:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: 45a8d6819ffbbb47703e902f46314319 SHA-1: 98231a70fdf8422750608d358ed912324650857f SHA-256: 7e9c5e9b43b93a8646ffc455f0b9ca2cf7c8cae6bed38b677c339a9d0d6874c7

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URLs, including one that appears to be a search query for weather information. The primary malicious URL identified is https://resalured.ru/strik. The PDF structure and embedded content suggest it's designed to redirect users to a network of potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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://resalured.ru/strik?utm_term=what+is+the+weather+like+in+washington+dc+year+round PDF link annotation
- http://bavimobuxadu.medianewsonline.com/courage_to_be_disliked.pdfIn PDF document text
- https://cdn.sqhk.co/konidadelan/hjLJgfX/pizetebifulu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4455886/normal_6049a76dbd7c5.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4447669/normal_5fc6f074471c6.pdfIn PDF document text
- http://sifimomikev.sportsontheweb.net/nezixigofujusul.pdfIn PDF document text
- https://cdn.sqhk.co/nobixapo/ddhjiig/splash_lagoon_winter_hours.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_5839b91986f547408268e287e96caf05.pdf?index=trueIn PDF document text
- http://rododibez.epizy.com/jmeter_summary_report_for_load_testing.pdfIn PDF document text
- https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_e58979467f1b47c39929dbb3d2c5bdca.pdf?index=trueIn PDF document text
- https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_ed2871cf5b964afba45539dce0bfba1d.pdf?index=trueIn PDF document text
- https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_4975a866d6ae4afa89a5717e1f3fc519.pdf?index=trueIn PDF document text
- http://lotuseposan.epizy.com/surabumurafun.pdfIn PDF document text
- https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_958760057b8b4b11b3fd7cd8251585f2.pdf?index=trueIn PDF document text
- http://tizivedimusos.epizy.com/zupifaju.pdfIn PDF document text
- https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_21deb7a4609e4caeba69eb704429c6ba.pdf?index=trueIn PDF document text
- https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_5c9d550d011a47c287d3783cd02cf831.pdf?index=trueIn PDF document text
- https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_5366b2a2c685464aa7e3edbded84731c.pdf?index=trueIn 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_off0000e72d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE72D	5356 bytes
SHA-256: `76e72ef478b9075df061e1068bff957b5674ef35fa93930cffdbed01d49729a7`
`font_01_sfnt_off0000f969.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF969	11048 bytes
SHA-256: `2e34558089f5b453943b7f61226149d5e750455bc01435aa58bfe533c2b1ea7b`
`font_02_sfnt_off00011ef0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EF0	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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