PDF malware analysis — malicious · 0bf3d34108a9bf00

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 23:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: ee054810a4ddbb720d30829b52eadb50 SHA-1: 3f40d10ad61f59436b697679b3e0f45c3ed4a559 SHA-256: 0bf3d34108a9bf004cbd3ad7a2c6a933f0fa9b25580872b3aec890e9a4d9ef1f

66 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While the document body is heavily obfuscated, the presence of many links and the link farm heuristic suggest a lure to external resources, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

Heuristics 4

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://3mfa.com/images/editor/files/46511082811.pdf In PDF document text
- http://bona-agra.pl/Upload/file/31447870954.pdfIn PDF document text
- http://themadthinker.com/temp/vinney/HTML/userfiles/file/xuvibesi.pdfIn PDF document text
- https://client-sms.com/ckfinder/userfiles/files/67468679294.pdfIn PDF document text
- https://haltia.mx/sii/ckfinder/userfiles/files/kedebadepo.pdfIn PDF document text
- http://bitree.net/ckfinder/userfiles/files/tisovurufel.pdfIn PDF document text
- https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/396419695.pdfIn PDF document text
- http://hanmih.com/userfiles/file/20210914012140.pdfIn PDF document text
- https://mannerfeltdesignteam.se/ckfinder/userfiles/files/pizegizole.pdfIn PDF document text
- http://www.ssc-ras.ru/ckfinder/userfiles/files/11826804812.pdfIn PDF document text
- https://e-motorcycle.tw/upload/emotorcycle/files/57771417834.pdfIn PDF document text
- http://fertilityupdates.com/userfiles/files/99268566244.pdfIn PDF document text
- https://www.campacinter.com/image/upload/File/lupofewikomivogexuga.pdfIn PDF document text
- http://agisma.ru/files/pages/files/zepuzusaniwubi.pdfIn PDF document text
- https://motty-etai-sharon.com/files/files/42836874130.pdfIn PDF document text
- http://ipsaix.com/ckeditor/ckfinder/userfiles/files/sitafapojapuzokurato.pdfIn PDF document text
- http://safires.cz/ckfinder/userfiles/files/49049543192.pdfIn PDF document text
- https://xn--z4qq44i.xn--kpry57d/upload/actfiles/14729477358.pdfIn PDF document text
- http://serting.eu/userfiles/files/98067107317.pdfIn PDF document text
- https://roarmysecurity.ro/mm/file/xuvumibaterudi.pdfIn PDF document text
- https://suma.ca/upload/editor/file/zavonofipenagokimezurizi.pdfIn PDF document text
- https://pomtco.com/technical/files/file/48274464132.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cashflow+the+investing+game+apkPDF 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_off0000adb9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xADB9	10980 bytes
SHA-256: `05ca3d80d21c13a131add4d49bf0590778c79d9f848cd7053a32530913d5d2ed`
`font_01_sfnt_off0000c71e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC71E	16128 bytes
SHA-256: `93af88f2c2de741487c15dc01539afcceca87788bac6c7262f6da4868bea7bf3`
`font_02_sfnt_off0000f0aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0AA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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