PDF malware analysis — malicious · 0f94f23f7a2db4b4

MALICIOUS

PDF

87.1 KB Created: 2021-04-15 04:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15

MD5: d1d63a5f8b42dc9a33ee77851b2ee15e SHA-1: b2d26b3b8cba1a014bdf790f91754bfa41e30fb1 SHA-256: 0f94f23f7a2db4b4a3b38cec5eae58255da2de081d6a13176a664eb25b828fa1

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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, with a critical finding of a "PDF_SEO_LINK_FARM". This suggests the document's primary purpose is to redirect users to potentially harmful external sites, possibly for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest an attempt to direct users to malicious content.

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://bologen.ru/strik?utm_term=temple+of+set+egypt PDF link annotation
- http://berasowugixo.mywebcommunity.org/74762621874.pdfIn PDF document text
- http://zelegurelo.iblogger.org/pronoun_worksheets_for_4th_grade.pdfIn PDF document text
- http://bujaxodu.iblogger.org/nauka_angielskiego_podstawy.pdfIn PDF document text
- https://puzifisabu.weebly.com/uploads/1/3/1/3/131378936/najekidamazizoli.pdfIn PDF document text
- http://gopubewigofopa.iblogger.org/jugabugosukix.pdfIn PDF document text
- https://tenogamux.weebly.com/uploads/1/3/2/6/132681545/sunef-wimazu-jusarisume.pdfIn PDF document text
- http://ravigimojamel.mypressonline.com/bekin.pdfIn PDF document text
- https://pefopurez.weebly.com/uploads/1/3/4/3/134375846/066f4e1d1cac.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_af2c096cebf348a483852bb249541be7.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/94b05da3-da09-4829-8837-d3b7a61dbbb2/sotov.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/93968500-956f-4a6c-a17e-7335148c8bcf/how_many_pages_is_dork_diaries_13.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d8a7bdd6-b800-47a5-acdc-2e28a77bc9bd/27021626786.pdfIn PDF document text
- http://mizetum.onlinewebshop.net/tifememavuwad.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b1c41b9c-14ba-4835-bd53-4cf1beed110c/historia_do_cafe_no_brasil.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/34423917-f091-4057-b1dd-0c1d8e9d61f7/26929529488.pdfIn PDF document text
- https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_a1702f9132ce492ca90f955773a22d41.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/e12715c7-9bae-44b2-bc22-899670a4d4f9/sivule.pdfIn PDF document text
- https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_9debccfba2f841bc9bda16f6421874c8.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00011834.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11834	4964 bytes
SHA-256: `dd1ecd43013f456f0356feef125545592544baa47a6bbe8e7f1ffc6ee606efff`
`font_01_sfnt_off0001291d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1291D	11500 bytes
SHA-256: `b46153f6d11ac7a29098e9c2e99c4dfb61c48417d3244427e1df863f5351b38b`

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