PDF malware analysis — malicious · f0cb6f3cf2f83143

MALICIOUS

PDF

77.4 KB Created: 2021-03-15 01:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07

MD5: 899a5c256d73800f5c1fa519ea3914e1 SHA-1: 4263239a286d63b207b864a64232b25c07b6a6c5 SHA-256: f0cb6f3cf2f83143d688f0ff2ec23292d50c7c3e2f592e26c4cf89e4394596c8

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a primary function of redirecting users to potentially malicious or deceptive content.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/wix?keyword=dogma+blu+ray+uk PDF link annotation
- https://cdn-cms.f-static.net/uploads/4410989/normal_6033f68872932.pdfIn PDF document text
- https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/ca5cb0.pdfIn PDF document text
- https://jisogixisizula.weebly.com/uploads/1/3/4/3/134328009/vedodusedotirebi.pdfIn PDF document text
- http://randname.ru/zawigvw33m.pdfIn PDF document text
- http://my-favshopd.online/mitologia_griega_para_nios_medusaiodlm.pdfIn PDF document text
- http://ru-1.casa/smartsheet_gantt_chart_examplesnaa1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368500/normal_602c762890f41.pdfIn PDF document text
- https://nabisafuv.weebly.com/uploads/1/3/1/4/131413222/4fb6d.pdfIn PDF document text
- https://pebenari.weebly.com/uploads/1/3/4/5/134518206/kubunubap.pdfIn PDF document text
- http://sanatoriy-izumrudny.ru/141696489890q0tc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4451955/normal_6029e07b332ca.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4484820/normal_5ff5a426addb5.pdfIn PDF document text
- http://popijizixoxovoj.iblogger.org/83593758355.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_52dcfe90f0c54d7dbd6de157f4a6da5f.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/zuxime/77052217168.pdfIn PDF document text
- https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_b57676fc14f84b9e969cf6e3980aa3a5.pdf?index=trueIn PDF document text
- http://keladuwuk.rf.gd/fololutofabagaw.pdfIn PDF document text
- https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_0470de6eed9345cd95c288bc7dbee44f.pdf?index=trueIn PDF document text
- http://rojotafapexaj.rf.gd/audio_editing_software_for_android_tablet.pdfIn PDF document text
- http://kifavorufodib.rf.gd/clases_de_ingles_basico_gratis.pdfIn PDF document text
- https://s3.amazonaws.com/xirixepo/vlookup_google_sheets_different_tab.pdfIn PDF document text
- https://s3.amazonaws.com/fujadabez/patricia_berdichevsky.pdfIn PDF document text
- https://s3.amazonaws.com/badodemebo/90315413488.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f00d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF00D	5132 bytes
SHA-256: `a014d1ce75ccbb3c656e1c8d934a3ec74580614e63d18cddd64e409d405ec412`
`font_01_sfnt_off0001017d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1017D	10868 bytes
SHA-256: `a7faccf67b114bf24ab8bd17d7ff41c6cfb92996deda9fd99e8189916e36734f`

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