PDF malware analysis — malicious · 13f8b202a6fa3177

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 20:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27

MD5: 97a7fbbe702225cd32281cf5f4152896 SHA-1: 53eea2eeac6aa6c3c70091b6c18305f889a6f054 SHA-256: 13f8b202a6fa3177743b4d4b3f08f7c016afd7dd993dad17f91b76388ae4e4ce

66 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links suggests an attempt to lure users to malicious sites. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, identifying the PDF's structure as a link farm on disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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://daivupaint.com/img-chamthi/files/93016619402.pdf In PDF document text
- http://webminmax.com/userfiles/file/3903284066.pdfIn PDF document text
- http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/5734173293.pdfIn PDF document text
- http://cambridgekapurthala.com/damana/userfiles/file/97170733593.pdfIn PDF document text
- http://vallovin.it/userfiles/files/loxoxixalobij.pdfIn PDF document text
- http://rideco.hu/upload/file/kabevopusufizapadivow.pdfIn PDF document text
- http://stressmanagement-karriere.de/userfiles/file/35960757610.pdfIn PDF document text
- http://exoticland.bg/upload/files/files/69813470330.pdfIn PDF document text
- http://mibenjamin.com/userfiles/file/zogesesoxexepe.pdfIn PDF document text
- https://firsatpin.com/calisma2/files/uploads/76678412340.pdfIn PDF document text
- http://kerekesvillszer.hu/UserFiles/file/sekirumeraruniseza.pdfIn PDF document text
- http://vibrobeton.by/pics/files/jeretexefuna.pdfIn PDF document text
- https://gemicilojistik.com/userfiles/upload/file/28296781553.pdfIn PDF document text
- http://scales-center.com/shop/fck_file/file/1844767084.pdfIn PDF document text
- http://a2itsolutions.com/chop/multimedia/userfiles/file/mupotinifometosib.pdfIn PDF document text
- http://www.herbertvanderbrugghen.nl/draft/31973651257.pdfIn PDF document text
- http://ilyxrace.com/userfiles/files/filoxunovud.pdfIn PDF document text
- https://nutrishop.in/ci/userfiles/files/71427168731.pdfIn PDF document text
- http://ageofwonders.buka.ru/sadm_files/dagenigof.pdfIn PDF document text
- http://irodaszer.lukinserv.hu/file/zekepumuj.pdfIn PDF document text
- http://mim2010.ru/userfiles/file/tikekujikozosawokepu.pdfIn PDF document text
- https://rivieresoceanie.com/userfiles/file/lagezomuzuguzuletazizewi.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dream+city+mod+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_off0000d594.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD594	17180 bytes
SHA-256: `5e7aec6ba3431d893cce7e3f6a4b79d993a9beb5e21a20bb312eaf1a91db4be1`
`font_01_sfnt_off0001024a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1024A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011a61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A61	10564 bytes
SHA-256: `4c9162f837d9c72ac44b6e4c2f33f82d80818a86593517b4b9c9342d9aab9dc2`

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