PDF malware analysis — malicious · 158990fe22e78e88

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 14:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: 07efd58c728abaa11ffb0b886e3e86b7 SHA-1: cdc567f709217cc73d0f434bd8844e52c087c899 SHA-256: 158990fe22e78e8891b67a8acd08a0682e6a7fcb58a781e2a7e9fc14bf686c1b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript, which is often used to execute malicious actions within PDFs. The PDF also acts as a link farm, pointing to numerous external PDF files hosted on various domains, suggesting a distribution or phishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://samtekelektrik.com/files/24535219417.pdf In PDF document text
- http://sushistoryus.com/uploads/files/91578792697.pdfIn PDF document text
- https://ssvacancy.com/ckfinder/userfiles/files/jitutidivibufakaxetud.pdfIn PDF document text
- http://worshipedia.mobi/sites/default/files/file/volavivunemofijojes.pdfIn PDF document text
- http://quantri.thaisonpalacehotel.com/upload/files/winejegorojadage.pdfIn PDF document text
- https://keepingscore.org/userfiles/file/rizejunejerogevewixivem.pdfIn PDF document text
- https://hongming-eco.com/userfiles/file/xosuxeganekewubevak.pdfIn PDF document text
- http://bertrandetgastineaudesigners.com/userfiles/file/96873543034.pdfIn PDF document text
- https://funbugs.ie/userfiles/file/dotixibodedep.pdfIn PDF document text
- http://mhinflatable.com/upload/file/fakokabeti.pdfIn PDF document text
- http://taispacedesign.com/upload/files/77511992641.pdfIn PDF document text
- http://bukharaalpharetta.com/sites/default/files/file/diriwavaker.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/25b174451cfbfb31ddaa0cc01d0b910f/7923008558.pdfIn PDF document text
- https://bozoklar.org/ckfinder/userfiles/files/40611790035.pdfIn PDF document text
- https://fix2go.info/userfiles/file/6173864476.pdfIn PDF document text
- http://yung-shun.com/userfiles/file/wofavupigugij.pdfIn PDF document text
- http://theeultimatenetworker.com/ckfinder/userfiles/files/52768482361.pdfIn PDF document text
- http://mundori.com/js/ckfinder/userfiles/files/46542569895.pdfIn PDF document text
- http://myshiou.com/uploads/files/202109030501545158.pdfIn PDF document text
- https://bandotrading.it/uploads/file/85655404087.pdfIn PDF document text
- https://supermagnum-bg.com/userfiles/file/fumobefetukomore.pdfIn PDF document text
- http://walosports.cl/userfiles/file/kiwabit.pdfIn PDF document text
- http://www.lovebliss.tw/UserFiles/files/36908497184.pdfIn PDF document text
- http://www.binghan.my/userfiles/file/8219220802.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=asphalt+4+androidPDF link annotation
- 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://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_off0000bfc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBFC8	17436 bytes
SHA-256: `6c6fa49d59488c36e97952b775ae289183d9866c4209a1318dd735e059419cdd`
`font_01_sfnt_off0000ec33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC33	10416 bytes
SHA-256: `f8a2b89644b8a18abbe18b44cb5451acc5b85b04b4020f28390e898dfcd582e1`
`font_02_sfnt_off000103c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103C0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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