PDF malware analysis — malicious · 90c9a0ffe42749d8

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 20:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: e063d7b6a78f158f3162e38d06cf6bc3 SHA-1: 5b0148d4d2c1f2e36de5bd6178361ecd94f48583 SHA-256: 90c9a0ffe42749d83f036af44f9b3453ad5d697f0c51c555bd519e0079e547fe

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that redirect to other PDF files, suggesting a link farm designed to obscure malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of external URIs and a 'download button' heuristic further supports the attack pattern of luring users to download content, which is likely malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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.
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://ketchas.ru/uplcv?utm_term=breaking+brooklyn+full+movie+online+free PDF link annotation
- http://bora.su/ckfinder/userfiles/files/nomodiradafu.pdfIn PDF document text
- http://yasairamenbar.com/uploads/files/dawuzake.pdfIn PDF document text
- http://autoscuolemontagna.it/userfiles/files/potebak.pdfIn PDF document text
- http://pokemom2.com/uploads/files/38452915058.pdfIn PDF document text
- http://pokwuttibut.com/file_media/file_image/file/17057202310.pdfIn PDF document text
- https://digireg.ru/upload/pupujofibisikozigoxidok.pdfIn PDF document text
- https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614230835b0ae---namipuwisanu.pdfIn PDF document text
- http://sentezetutmerkezi.com/upload/ckfinder/files/jagisozawamowekurewo.pdfIn PDF document text
- https://arichaindia.com/userfiles/file/60840029995.pdfIn PDF document text
- http://bsbcarpet.com/userfiles/file/27754101131.pdfIn PDF document text
- http://fsoa.cn/userfiles/file/zuvizebuwimowizuti.pdfIn PDF document text
- http://travelci.ru/ckfinder/userfiles/files/fepijusuxetajodemigosuf.pdfIn PDF document text
- http://c-amc.com/upload/files/wojufimubisonuxizi.pdfIn PDF document text
- http://2478.ru/admin/ckfinder/userfiles/files/liwusuju.pdfIn PDF document text
- http://jszl-rolls.com/filespath/files/20210915162025.pdfIn PDF document text
- https://sanipacific.com/attachment/file/10416094492.pdfIn PDF document text
- http://riccaassociati.eu/userfiles/files/tinavopumevulo.pdfIn PDF document text
- https://cihangirhotel.com/upload/ckfinder/files/95141246882.pdfIn PDF document text
- http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/98326399449.pdfIn PDF document text
- http://sensi-leszno.pl/userfiles/file/memixexepaweravok.pdfIn PDF document text
- http://hrt-foto.hu/_user/file/jaloxunogugubun.pdfIn PDF document text
- http://brmxn.com/userfiles/file/20210909060052_yzwtz1.pdfIn PDF document text
- https://shoppingplanet.ro/ckfinder/userfiles/files/gizikunidefabonagum.pdfIn PDF document text
- http://nhuaduongnhapkhauaz.com/upload/files/depegeriranemiv.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://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_off0000cc7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC7E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e490.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE490	17708 bytes
SHA-256: `f642310a1a22024ff9c3a88294e9c2fae05dd5f453024a77b4606aa1a42113da`
`font_02_sfnt_off000112bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112BD	10856 bytes
SHA-256: `be7e500553593d8018cf58a5f87ef2e492f1e1711bd0a3343cf2bb8578e0ee92`

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