PDF malware analysis — malicious · dbd7ed20ca84c7af

MALICIOUS

PDF

98.3 KB Created: 2021-04-26 11:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 410e9b5c69ed00963fccb90c57bdf445 SHA-1: 6b4eddb7ca21bf13ba48463f69a6c97cf9640e47 SHA-256: dbd7ed20ca84c7afda58a69a8e29af85000a294e0729e2e8c0d6f0e7ea6a2de4

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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 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://zajinet.ru/strik?utm_term=sunbeam+heated+blanket+twin+fleece PDF link annotation
- http://servisvds.ru/foxufobeximugtlzh.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4373008/normal_5ffd6a4cd88e8.pdfIn PDF document text
- http://jadaribod.mygamesonline.org/14811139656.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454180/normal_5fe79495555dc.pdfIn PDF document text
- http://kigaruzolalo.mypressonline.com/download_buku_belajar_membaca_anak_tk.pdfIn PDF document text
- http://cafechorsu.ru/kirigowazudcp5t.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4502567/normal_5fe144e8a966a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4461791/normal_5ff0c85b468f1.pdfIn PDF document text
- http://qwonder.space/english_grammar_exercises_online_with_answerse8605.pdfIn PDF document text
- http://bigijawiv.scienceontheweb.net/baixar_xchange_editor_baixaki.pdfIn PDF document text
- http://latuha.com/modalidades_de_trabajo_en_primaria_aprendizajes_clavel2e3q.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/gonasidupij/84830076842.pdfIn PDF document text
- https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_7b6c2872d6a840a18533b415f9060f9f.pdf?index=trueIn PDF document text
- https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_2c222b699acd4a989ac6f349def022a0.pdf?index=trueIn PDF document text
- https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_c49bddc6b3824389bb990df76689621d.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/sedowedi/93468671536.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7bcab962-f2e8-494a-b7ff-c3e1b53db796/43661103545.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1f1af1b5-73a9-41ee-818d-f866da78812b/a_song_of_ice_and_fire_most_evil_characters.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/bd2991dd-fe67-4258-a16e-f772f1c923d7/81462465203.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00011eaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EAF	5160 bytes
SHA-256: `7a0c7391e2424ae42870b32b8ad4508179b507c1b9b19762c33c5f3e53eaf98a`
`font_01_sfnt_off00013022.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13022	12416 bytes
SHA-256: `640ff3583b72cc9e7ff6fce5cd29f944a87a0734954a56726d996e41fe66023b`
`font_02_sfnt_off000158b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x158B9	16204 bytes
SHA-256: `c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449`
`font_03_sfnt_off00016de8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16DE8	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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