PDF malware analysis — malicious · 9faaf6f5fc91d1a0

MALICIOUS

PDF

78.0 KB Created: 2021-05-07 17:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: db35ca0a71cfe1d34bac53f1b2528cc6 SHA-1: 561cdc2e2bb7e182c25dc02510d4603ad1357f6b SHA-256: 9faaf6f5fc91d1a0d655b9074f61ff578aa8cdd27cdd4059a02f071ac2f29062

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains multiple external URIs, with a primary suspicious URL being https://kuzutuzo.ru/strik. The document body, though heavily obfuscated, suggests a lure related to device connectivity, likely to direct users to malicious content. No scripts were extracted from this sample.

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://kuzutuzo.ru/strik?utm_term=how+to+connect+soundpeats+trueair PDF link annotation
- https://static.s123-cdn-static.com/uploads/4465274/normal_5ff9ca732b05f.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4383704/normal_5fe09dd264a5b.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4482853/normal_5fe2571a3bcca.pdfIn PDF document text
- http://kositexujir.sportsontheweb.net/basecamp_manual.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454171/normal_604cfee897632.pdfIn PDF document text
- http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://zamutuxagen.epizy.com/sunekuzupef.pdfIn PDF document text
- https://s3.amazonaws.com/mikibetiv/baby_grand_piano_sale.pdfIn PDF document text
- https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_6dbb41fe5f2b466d927c0ef295f9ac33.pdf?index=trueIn PDF document text
- http://janalusexisowa.epizy.com/equity_buyout_agreement_template.pdfIn PDF document text
- https://5dfb2dbd-6c80-4a99-afab-57dcddd938ef.filesusr.com/ugd/79d40d_e08975ed8d344dbf8d602803509b58a3.pdf?index=trueIn PDF document text
- http://ruxurosagogaru.epizy.com/rozexopuzizuzibutelobo.pdfIn PDF document text
- http://dunupilopun.epizy.com/car_accident_report_template_uk.pdfIn PDF document text
- https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_6ea34b3e589f4168b1f631e321d1c04d.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/jobavo/bizerba_gsp_hd_parts_manual.pdfIn PDF document text
- https://s3.amazonaws.com/bejikefowu/best_comfort_oil-filled_radiator_heater_reviews.pdfIn PDF document text
- https://73e8eba8-f08a-4c12-987a-519a82e171c2.filesusr.com/ugd/19159f_0d5dee8715b1466ba1c182660386b58c.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/womirofop/how_to_view_cursor_coordinates_in_autocad_2015.pdfIn PDF document text
- https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_3b18337a52c341c19c3a67eeabd10aef.pdf?index=trueIn PDF document text
- http://polabufu.myartsonline.com/1113841258.pdfIn PDF document text
- https://s3.amazonaws.com/jawusawar/wizisaratepagexarugomewu.pdfIn PDF document text
- https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_f114d42490f5455384d1b062662f0537.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_off0000df25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF25	1636 bytes
SHA-256: `27967a5953a2b5fb5a6d79cb5ae17d40159cda34b149f7dda20fa2dcb1a964c1`
`font_01_sfnt_off0000e758.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE758	5088 bytes
SHA-256: `f03a5a2966456a7f5eb4013b0b6896dae1e6d96df16660d698716e925cae62fb`
`font_02_sfnt_off0000f8c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8C0	16376 bytes
SHA-256: `c49db58e06eb9191de74bfc15334e2dd7cb74c8cd7b5ee4ad9340bb89113f61f`

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