PDF malware analysis — malicious · de4d3c6bed41539c

MALICIOUS

PDF

82.7 KB Created: 2021-02-23 12:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03

MD5: 59934ee8236388a6c721d75ee8d6cdf8 SHA-1: 9b8a8c4075a6f6d23700b25209cb1d35746fdaa8 SHA-256: de4d3c6bed41539c299d4b7d5c3c29af9e318bb0d5a37628f0f5d19f43ee2273

226 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. Notably, it includes a 'Clipboard command execution lure' heuristic, indicating the document instructs users to copy and paste commands into a shell. This is a common technique to trick users into running malicious code, likely to download and execute a second-stage payload. The embedded URLs and the nature of the lure point towards a phishing or credential harvesting campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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.
Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE

Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
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://baarspo.ru/123?utm_term=how+to+fix+msvcr71.dll+file+missing+error PDF link annotation
- https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/vubadabitimerili.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4453553/normal_6032a5b554e35.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393364/normal_601cf8e69a683.pdfIn PDF document text
- https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/9e5c78.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447101/normal_602ba4545851c.pdfIn PDF document text
- http://toxedajenoxin.66ghz.com/christmas_bake_sale_poster_template.pdfIn PDF document text
- https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/xolatagujodasadibif.pdfIn PDF document text
- https://wutusexiradolo.weebly.com/uploads/1/3/0/9/130969471/2270265.pdfIn PDF document text
- https://lonitavow.weebly.com/uploads/1/3/4/3/134355974/134349dabc.pdfIn PDF document text
- https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/koboj.pdfIn PDF document text
- https://reseviris.weebly.com/uploads/1/3/5/4/135400779/milafonolidita.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
- http://vutakeba.epizy.com/73042854370.pdfIn PDF document text
- https://s3.amazonaws.com/zowibatev/mosog.pdfIn PDF document text
- http://kurejaj.epizy.com/5625868369.pdfIn PDF document text
- https://s3.amazonaws.com/xofalepelala/letters_to_santa_template.pdfIn PDF document text
- http://fisetefukuwod.rf.gd/current_aha_cpr_guidelines_2018.pdfIn PDF document text
- https://s3.amazonaws.com/zuguvoxoki/google_sheets_sumif_not_error.pdfIn PDF document text
- https://s3.amazonaws.com/xelimewat/enhancv_compact_template.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f8a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8A2	5264 bytes
SHA-256: `6fbf529434a75fd5e5d9d7f513d822c9ab5dd46aa865ad701df51c9120ae838f`
`font_01_sfnt_off00010aa1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AA1	10612 bytes
SHA-256: `e95d3868767f2d4f4781a120c35f917c975164624bdc67019b3ee19f4084a188`
`font_02_sfnt_off00012ed3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ED3	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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