PDF malware analysis — malicious · 637a90d9cfabaee1

MALICIOUS

PDF

81.7 KB Created: 2021-05-23 14:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: e73277a936301a81520adf4513328c19 SHA-1: 54af18df18b09f18d756575b86bd7e658880b1e2 SHA-256: 637a90d9cfabaee14b10396b145f96d7163bc1fea7bce9e6994eb6cd0f2533b4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or malicious content delivery attempt. The presence of a large number of external links, including a specific URL pointing to 'midufefew.ru', suggests the document is part of a link farm or phishing campaign designed to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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.
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://midufefew.ru/strik?utm_term=topologia+mixta+caracteristicas+ventajas+y+desventajas PDF link annotation
- https://cdn-cms.f-static.net/uploads/4427103/normal_6062491a9b316.pdfIn PDF document text
- https://teraxumafelenug.weebly.com/uploads/1/3/4/7/134747654/zakeser.pdfIn PDF document text
- https://mafewesoxadix.weebly.com/uploads/1/3/4/6/134697647/f26fa37da8a26.pdfIn PDF document text
- https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/revuzajuxifebimap.pdfIn PDF document text
- https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/28a14e543947a.pdfIn PDF document text
- https://danupinizagene.weebly.com/uploads/1/3/1/4/131483344/2790467.pdfIn PDF document text
- https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/2633490.pdfIn PDF document text
- https://rujedupexiveviz.weebly.com/uploads/1/3/4/8/134874221/2644576.pdfIn PDF document text
- https://kekoweditolig.weebly.com/uploads/1/3/2/6/132683085/40e50.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4479454/normal_5fdc552edc816.pdfIn PDF document text
- https://zawoluzowusemad.weebly.com/uploads/1/3/4/6/134697528/1d566.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4402486/normal_6018afbe0835a.pdfIn PDF document text
- https://kivenawuvu.weebly.com/uploads/1/3/1/1/131163776/rodiwa.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://s3.amazonaws.com/mubefula/warranty_deed_form_florida.pdfIn PDF document text
- https://s3.amazonaws.com/folexapurilowe/vebad.pdfIn PDF document text
- https://s3.amazonaws.com/lolaritemukole/wegotikirawobomudizalawi.pdfIn PDF document text
- https://s3.amazonaws.com/kofabube/all_video_converter_free_cnet.pdfIn PDF document text
- https://s3.amazonaws.com/rufonali/synonyms_worksheets_for_third_grade.pdfIn PDF document text
- https://s3.amazonaws.com/sabobenuwe/advanced_filter_to_another_sheet_excel.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_off0000f2d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2D5	5436 bytes
SHA-256: `a3e5dde26267d06c16297f80ebddc314f98f3960a0eae5a678cd0b86f88228d3`
`font_01_sfnt_off0001054a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1054A	11096 bytes
SHA-256: `8e512667d52748d60a42bd06ccb048550c43a28a3a8e83655c364d0d9c0de490`
`font_02_sfnt_off00012936.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12936	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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