PDF malware analysis — malicious · 86ccf31b26a18abf

MALICIOUS

PDF

81.8 KB Created: 2021-06-04 07:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 351d336ce3bff5fabc1b8688d8b4e085 SHA-1: c407ed0f954753c77dcdd083e0462664a94282f4 SHA-256: 86ccf31b26a18abf70f1e2e2d1f2472ddaaefe077e3fc99ef8687ea6000e41f1

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to domains with unknown or disposable reputations, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The embedded document body text, though garbled, appears to be a lure related to game downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://archism.ru/pbw?utm_term=gta+4+t%25C3%25BCrk%25C3%25A7e+yama+full+indir+gezginler PDF link annotation
- https://cdn-cms.f-static.net/uploads/4427821/normal_601da396c5415.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469641/normal_600fbbb75891a.pdfIn PDF document text
- https://lukogazusewof.weebly.com/uploads/1/3/4/6/134643336/fazeromaredupep-dugubeguwexu-xivufakemadomo.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4472182/normal_6056c1c82bd92.pdfIn PDF document text
- https://menikevolag.weebly.com/uploads/1/3/4/2/134234624/122829b46b1.pdfIn PDF document text
- https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/raxab-nixuni-pujuwof-notinamut.pdfIn PDF document text
- https://nebelifufenav.weebly.com/uploads/1/3/1/4/131437331/9524739.pdfIn PDF document text
- https://sozejelef.weebly.com/uploads/1/3/4/6/134600180/zurezufaxozuju-wuganozi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4496216/normal_60191fb08c3c4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447447/normal_60229f9bcbc85.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4377112/normal_5ff354464d637.pdfIn PDF document text
- https://nogorixarolixi.weebly.com/uploads/1/3/0/7/130740589/subudotaxen.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447874/normal_606cdf45459ea.pdfIn PDF document text
- https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/03947f140f35.pdfIn PDF document text
- https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/buwewu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4384639/normal_6055598e3ddf3.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/ed352808-048c-4d06-9c43-8d2f4394d27c/22787287444.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f496e9a3-940a-418f-8f06-4ca063e8ed9e/what_is_the_book_acres_of_diamonds_about.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c21f6f15-8984-4f9b-ad34-2c16f12b5163/hard_reset_linksys_wrt120n.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/03241cd7-9547-467a-904d-20775094e518/33471893890.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f0a3a666-ab0c-4a0f-ad22-3e00debc8014/95034815854.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ea40293e-a14b-4429-bb24-c3bf658faa1c/57558690949.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/07853b54-bd02-4319-81dd-6c4b5c1f1ce8/rakitikowuku.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e862.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE862	5684 bytes
SHA-256: `b2a3654895f4f8d3fb70ab0b4297a292213dac7ca5cb790e92d227848e607af6`
`font_01_sfnt_off0000fb9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB9C	12280 bytes
SHA-256: `21e0c854e570e0ac1995f0c39a5386209cacca8b74bcbb464bddd053e3518d1b`
`font_02_sfnt_off00012219.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12219	16204 bytes
SHA-256: `c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449`

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