PDF malware analysis — malicious · 741e7b76a2fd1c08

MALICIOUS

PDF

79.2 KB Created: 2021-06-01 15:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: 1759991fc724a542f6a03f8eefcb6955 SHA-1: 4165fbd02cd8f6830cda2f107955341f81466816 SHA-256: 741e7b76a2fd1c08c033fc29661a347f2031b67e09ddaa9b9bed24007ab97b98

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The primary URL 'https://cructi.ru/pbw?utm_term=achyutam+keshavam+female+version+mp3+song+download' indicates a deceptive attempt to trick users into downloading further malicious content by appearing as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://cructi.ru/pbw?utm_term=achyutam+keshavam+female+version+mp3+song+download PDF link annotation
- https://cdn-cms.f-static.net/uploads/4390330/normal_6029810048cd3.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4416321/normal_6000a888b6bad.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375887/normal_5fe8ec5a21820.pdfIn PDF document text
- https://tatagufok.weebly.com/uploads/1/3/4/6/134692967/xevopaxemeliw.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4486965/normal_5ff962778d9e4.pdfIn PDF document text
- https://siraxaroxaran.weebly.com/uploads/1/3/1/4/131483069/vuxon.pdfIn PDF document text
- https://tomutoremaduv.weebly.com/uploads/1/3/1/3/131398477/0a28868c3.pdfIn PDF document text
- https://weritudasokapo.weebly.com/uploads/1/3/4/4/134494226/todazunibalubom.pdfIn PDF document text
- https://sozobuxetezubu.weebly.com/uploads/1/3/4/5/134527793/tesotupivesivasog.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4485809/normal_5fd787b4da370.pdfIn PDF document text
- https://wuxejerupetumul.weebly.com/uploads/1/3/4/3/134341496/5696249.pdfIn PDF document text
- https://zabamatuli.weebly.com/uploads/1/3/4/3/134348910/kozetawevipov.pdfIn PDF document text
- https://nugesipepisi.weebly.com/uploads/1/3/4/0/134042061/534e98b1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4506159/normal_603ae842780c3.pdfIn PDF document text
- https://fozaxuvuten.weebly.com/uploads/1/3/3/9/133986835/nenitab_gigapa.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4385028/normal_5fd7fb9b6794c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4377938/normal_60606baf8858a.pdfIn PDF document text
- https://givudaxoj.weebly.com/uploads/1/3/4/4/134490896/6595c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391331/normal_606360cbaf9a6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4492600/normal_601f1ecbafd5b.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://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_off0000e780.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE780	5920 bytes
SHA-256: `94586bccefa1f450b221398edf9ce62752b7a7d7b3d429227f1ba928976a2e22`
`font_01_sfnt_off0000fb98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB98	10972 bytes
SHA-256: `188cb377924557ec6366187fa0caff6d41c7eb7bedd3de750490b112804fa0f3`
`font_02_sfnt_off00012117.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12117	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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