PDF malware analysis — malicious · b9af5ca763e96abb

MALICIOUS

PDF

71.7 KB Created: 2021-03-17 00:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: 26278d80dfb25e2c5b8399253550c11f SHA-1: cd7897eadacf95e6a487b7e171fe98047e007a65 SHA-256: b9af5ca763e96abbd8717f3f98b7319b75718f09b0e6bf3e8027ee20a82b6b43

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing lure, specifically designed to trick users into downloading files by masquerading as a converter tool. The presence of a large link farm on disposable hosting, coupled with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The embedded URLs likely serve as entry points to further malicious content or exploits.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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.
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://soxebez.ru/award?keyword=adobe+pdf+to+word+converter+trial+version PDF link annotation
- https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/2155909.pdfIn PDF document text
- https://cdn.sqhk.co/fumazuri/id6u6oF/chromatic_guitar_tuner_for_pc_free_download.pdfIn PDF document text
- https://katesagi.weebly.com/uploads/1/3/4/8/134864962/pemaxanim-wujofin-zigaved.pdfIn PDF document text
- https://cdn.sqhk.co/zonurubo/gfgdBji/location_picture_lock_screen_windows_10.pdfIn PDF document text
- https://cdn.sqhk.co/wafifovuwel/ehifjiW/61286271807.pdfIn PDF document text
- http://gafegenuwegapok.iblogger.org/kumeraselovobol.pdfIn PDF document text
- https://cdn.sqhk.co/wifukatar/ciahdyZ/pixel_car_racer_gtr_lt5_tune.pdfIn PDF document text
- https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/nixoxiliwibebikowa.pdfIn PDF document text
- https://neninilez.weebly.com/uploads/1/3/3/9/133986457/f726bcfb2c.pdfIn PDF document text
- https://cdn.sqhk.co/safubuguva/M7uDgcP/sexivosetusozegukoga.pdfIn PDF document text
- https://cdn.sqhk.co/titubebojek/lL0jiLN/19003132501.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://zasagugidi.epizy.com/free_digraph_worksheets.pdfIn PDF document text
- https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_b3eb178580dd41cbb5d5150659d9ce95.pdf?index=trueIn PDF document text
- https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_4b37d2c5f76c4e489e27155691f2363b.pdf?index=trueIn PDF document text
- http://zowiseli.epizy.com/muv_full_form.pdfIn PDF document text
- https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_8d716f8719384b259c7df73ed3d76b83.pdf?index=trueIn PDF document text
- http://xegunapajom.epizy.com/grammarway_3_unit_1_answers.pdfIn PDF document text
- http://wadekazu.epizy.com/carrot_fit_app_android.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_off0000cf39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF39	3652 bytes
SHA-256: `e28ee1a77c6a59cb8bd281308c6d1b2f97fb81cba3bdaba4ecf3cbccfec88003`
`font_01_sfnt_off0000dc40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC40	5428 bytes
SHA-256: `ea12a09f47ad90c11c0b76640f2fbd2c50d84b26ccb2f0475a0338765085734d`
`font_02_sfnt_off0000eeda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEDA	9988 bytes
SHA-256: `17457e8ba47f39851eee71b133482070cff9659cd261cb4c5e75cb935fac5711`

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