PDF malware analysis — malicious · f52f92a41054b979

MALICIOUS

PDF

83.6 KB Created: 2021-03-10 21:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16

MD5: 4c0a21a21680328359c1ed922a4e4ba2 SHA-1: e4818068357600b8c4a37e5e923c01fa7d47d290 SHA-256: f52f92a41054b97968e1dc42e9a92c7e18dc5b266756dd594a78ef67da2368c3

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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 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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://golowaki.ru/wix?keyword=office+procedure+manual+cbic PDF link annotation
- https://zifidobu.weebly.com/uploads/1/3/4/3/134371145/2f0a6cfc37da8e.pdfIn PDF document text
- https://penaxixix.weebly.com/uploads/1/3/0/8/130813526/lujifamugolemok-zuxeridulil-fenigamupuz-wiwetek.pdfIn PDF document text
- https://cdn.sqhk.co/wavafinudow/hjLahj8/bergamasque_suite_sheet_music.pdfIn PDF document text
- https://cdn.sqhk.co/durotula/h6fijad/59094763360.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366324/normal_600eca868d439.pdfIn PDF document text
- https://cdn.sqhk.co/puvubuzu/fgggcaQ/zombie_roadkill_3d_apk_mod.pdfIn PDF document text
- https://ronunute.weebly.com/uploads/1/3/1/0/131070227/cc060.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4447467/normal_5ff0dd2ac1ea0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476427/normal_602b26d062a60.pdfIn PDF document text
- https://cdn.sqhk.co/ropobemuma/cWc7Qjj/rabudiwokododega.pdfIn PDF document text
- https://tozafutesaf.weebly.com/uploads/1/3/4/9/134900259/gogexebanenu.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4414502/normal_5ff24c87a4a26.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4453560/normal_603eb54bb9814.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449996/normal_5fd2972f6e9f5.pdfIn PDF document text
- https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/9aa474f9f4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4480383/normal_5fe8a8032f4c8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393033/normal_6011d0a165edf.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4494681/normal_5ff8c7b78c1e6.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://fedorahosted.org/lohitIn PDF document text
- https://uploads.strikinglycdn.com/files/d1a54f84-0897-4389-a666-3bd77be03e5b/66561544348.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0e000d2f-66da-4a0c-bac2-261b1555c0c4/lasiparubonu.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5030ce56-34e3-4b64-9aaa-b0aa3ad950aa/pastors_speech_in_wedding_ceremony.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_off0000f4b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4B4	5288 bytes
SHA-256: `5b10f3f8df6f00cf6ad6d09c9bf9e48a09205910f3bacfa1e8370cb57f45f59d`
`font_01_sfnt_off00010697.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10697	10636 bytes
SHA-256: `9b7256b42cce95724ca543e8941d8ead339d2c935f807a50d50ec6aced61345b`
`font_02_sfnt_off00012b41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B41	5528 bytes
SHA-256: `8b1ffd793872b707d819324d16cf0b39eb5afcf25d14aaf167fdb1fc776d9ca8`

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