PDF malware analysis — malicious · 966566b6b51f0124

MALICIOUS

PDF

80.0 KB Created: 2021-03-16 11:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20

MD5: e365db96ec403ec85e5122e1bec747e3 SHA-1: 2eeb91923a406189ff38f65c68889ca92372c35d SHA-256: 966566b6b51f0124c11b5f603202c3b41cff7fb3e41b934b48c26271f3c64da6

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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 http://fastnoutservice.ru/que_es_un_retrato_escrito_y_sus_caracteristicasiai8r.pdf In PDF document text
- https://static.s123-cdn-static.com/uploads/4374968/normal_5ff15be37cee8.pdfIn PDF document text
- http://igcopyrightforhelps.com/60628607431m5lax.pdfIn PDF document text
- https://cdn.sqhk.co/nuponoviva/yLFjfge/note_trainer_lite_learn_piano.pdfIn PDF document text
- http://bossyonlinex.com/how_to_find_angle_of_two_lineslm28i.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4418556/normal_601001cb73ea5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379482/normal_604d19812b986.pdfIn PDF document text
- http://bcpreactiva-enlinea.com/mekejotfyvef.pdfIn PDF document text
- https://cdn.sqhk.co/bapuparit/didQhbC/nobody_wish_memes.pdfIn PDF document text
- https://cdn.sqhk.co/lofakekaf/iKLuigU/jikewitipevevozeledokejem.pdfIn PDF document text
- http://amaryllis.space/laruliputodasakjrpvg.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449604/normal_601988fd541ce.pdfIn PDF document text
- http://tameenegypt.com/vehicle_inspection_report_template1nkud.pdfIn PDF document text
- https://cdn.sqhk.co/fukonovum/dGN0CQ2/write_japanese_alphabet_a_to_z.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447658/normal_602952a0d4ea5.pdfIn PDF document text
- https://ponafet.ru/wb?keyword=antiderivative%20of%20sin%5E2PDF link annotation
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/nunakixuma/graphic_design_books_2019.pdfIn PDF document text
- https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_dd2724dea9794211b76ddb2b1859276a.pdf?index=trueIn PDF document text
- https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_7b2f4cf44acc4ceba9d47b341b538fac.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/lixuduwonifa/funny_books_for_five_year_olds.pdfIn PDF document text
- https://s3.amazonaws.com/wiwamoxamo/what_are_the_four_levels_of_measurement_give_an_example_of_each.pdfIn PDF document text
- https://5c54d0bb-9de8-469b-abb1-33232a952ba9.filesusr.com/ugd/370e3f_d13d566f1e1a41fbadb1888d15166044.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/gupawupigawono/voridebefilojifavaxe.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e1fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1FE	5320 bytes
SHA-256: `83447061e03f06ff59c7e40be5d0e8e7a2f351ae19b8add5930e36eb787ad6c1`
`font_01_sfnt_off0000f448.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF448	11996 bytes
SHA-256: `e0ff41c37f9375165d20d6275dab211849c26673d05b7e7394971f379c8fbebf`
`font_02_sfnt_off00011dba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DBA	16080 bytes
SHA-256: `a534b91c4ec3d8756e3a834051570443c69e75f38d6508a28567570861ffac3d`

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