PDF malware analysis — malicious · c21f28e84f1ce484

MALICIOUS

PDF

76.4 KB Created: 2021-06-02 23:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25

MD5: 88477517e8c04bed74275daee796a3b6 SHA-1: 3da79db89524e3fcab484db392ce8f4b0be6df21 SHA-256: c21f28e84f1ce484a09e45de07256b0bece57a7bb453db83c68282420a0338c5

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The document contains numerous external URIs, with one prominent URL pointing to zajinet.ru, suggesting a phishing or malware distribution attempt. The presence of 'utm_term' in the URL indicates a potential tracking mechanism for the lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=batch+production+advantages+and+disadvantages+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4468814/normal_60231a0da8d51.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426812/normal_6062bce18f771.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4408195/normal_5fc6d28a7eb7f.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368740/normal_6001ee8d9d8bd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4502248/normal_602dab1e8c71d.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4453741/normal_60b28403147aa.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4371508/normal_60115dffed514.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367278/normal_5fdc09d75e797.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4416504/normal_5fce0e6a69a59.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4401691/normal_6018cd79317c4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4451231/normal_603c176b59c32.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379369/normal_600d1b41aa7cf.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://kufujibumufa.pbworks.com/f/what_time_does_chase_bank_close_on_saturdays.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b8ea75c3-2d54-4cb4-a78d-d2edd029bf00/zalivalunidenitaxabazem.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/36a891b4-67c2-4bf4-a4a5-9ebd9433c43f/middle_earth_rangers_forum.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6c6fd844-88e6-4616-a050-ccae70d755d5/mifesuzunirebolamef.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/412ed637-c080-40d7-88ef-27f790ec9337/is_the_canon_powershot_sx540_hs_a_good_camera.pdfIn PDF document text
- http://wuranosa.pbworks.com/f/how_to_consolidate_data_from_multiple_workbooks_in_excel_using_vba.pdfIn PDF document text
- http://tejudafo.pbworks.com/w/file/fetch/144461106/41449596444.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c5b3742d-5e52-49b1-96fa-6d446d639cf8/how_to_turn_off_demo_mode_sony_bravia_tv.pdfIn PDF document text
- http://jotoxipigi.pbworks.com/f/can_snapchat_go_in_dark_mode.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_off0000e172.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE172	5376 bytes
SHA-256: `949523a340221c5ec456a143534abfeae13f2f6983f8d9f62bdf98cf38c6da8d`
`font_01_sfnt_off0000f3b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3B4	9892 bytes
SHA-256: `525a440daca871467e1732306a146ebeb6c5bc5ad2fd75a494fde8998eb12076`
`font_02_sfnt_off00011571.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11571	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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