PDF malware analysis — malicious · 079d327e87e5d126

MALICIOUS

PDF

75.0 KB Created: 2021-03-07 10:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23

MD5: 12803b576525dbb2c4314b2182b8824d SHA-1: c678c1b48226a56f72c3bae1960b4425e3a61f74 SHA-256: 079d327e87e5d1262d8f7f39d15085de312cbca41089066008620e8c1dfd3533

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting and exhibiting characteristics of a link farm. The embedded URL 'https://mezovuduw.ru/strik?utm_term=how+to+find+the+missing+angle+measures+of+a+polygon' suggests a lure to a malicious site. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or a downloader.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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 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.
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://mezovuduw.ru/strik?utm_term=how+to+find+the+missing+angle+measures+of+a+polygon PDF link annotation
- http://belkwigs.com/zetaxetorenbdq20.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4403561/normal_5fe5972cb2205.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383692/normal_5fdb7387487f5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426085/normal_5fdbf77f3d37b.pdfIn PDF document text
- http://5euro.info/countable_and_uncountable_nouns_worksheetsj0i0c.pdfIn PDF document text
- http://prazdnikprosto.ru/which_is_the_best_website_to_learn_ethical_hacking1mp30.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4384832/normal_600d1cea7d342.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4387230/normal_5feb068c95a6c.pdfIn PDF document text
- https://cdn.sqhk.co/xubupigegi/jhgvjjP/cartoon_wars_part_1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4464065/normal_601c5e74c17f1.pdfIn PDF document text
- https://cdn.sqhk.co/verexumifo/aEbVIgD/benanebopavajezosek.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447662/normal_600dc9b0612c7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446400/normal_601aaa9c937e6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391621/normal_603972d95c63a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4406787/normal_5ffcb3073ef34.pdfIn PDF document text
- http://kino-vezde.ru/sat_math_formula_listk79zw.pdfIn PDF document text
- http://generatorsale.ru/where_is_the_idle_control_valve_locateda4b8w.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://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_86c3588b24ff43e8a010dec9768dc81a.pdf?index=trueIn PDF document text
- https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_7056071ce693429ca1ed0fa020dfd46f.pdf?index=trueIn PDF document text
- https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_5f9454b74f884e91b15d1d156d5e0a01.pdf?index=trueIn 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_off0000d76a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD76A	5492 bytes
SHA-256: `d1a45e6e4937c8e9963b1390cab3c3081af116a011d7a670d594380025c266ee`
`font_01_sfnt_off0000e9fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9FC	11028 bytes
SHA-256: `d34ab7bfa48ee9493639ee1812019b5044983181b7e94299adb00b7d27a66cbc`
`font_02_sfnt_off00010fc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FC8	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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