PDF malware analysis — malicious · af6c874a9c654647

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 12:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: c1007a1ec9c2d636f10e4d70eb9c73fc SHA-1: ccf55e8d570a7f462723d8ea640e74e713027742 SHA-256: af6c874a9c654647f46afdd818352df3b06361226118c60cf68e7e58a14a5628

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The PDF structure and embedded content suggest it is intended to redirect users to a collection of other PDF files, likely as part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of multiple external links points to a watering hole or redirection attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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 http://dush-kz.ru/uploads/fck/file/wamomipefuv.pdf In PDF document text
- https://arnetbilgisayar.com/upload/ckfinder/files/lumowigolupu.pdfIn PDF document text
- http://refinerlink.com/userfiles/file/mozizuxetolazalonavif.pdfIn PDF document text
- http://www.tiendadelbordado.com/ckfinder/userfiles/files/13965762270.pdfIn PDF document text
- https://www.pactforfamilies.org/ckfinder/userfiles/files/vimoxesivabubuliw.pdfIn PDF document text
- http://kalkulacka-hypo.cz/userfiles/files/3618953555.pdfIn PDF document text
- http://3qlohas.com/CKEdit/upload/files/zevofosujerimifen.pdfIn PDF document text
- http://www.urbanwaterways.info/files/299683462.pdfIn PDF document text
- https://matharu.ae/userfiles/file/lekanalabixexavovu.pdfIn PDF document text
- https://menu2uplus.com/images/file/befunalivikuni.pdfIn PDF document text
- http://posekatzahradu.cz/files/file/84944097724.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317494a50a6---21149455493.pdfIn PDF document text
- https://samsungklimalar.com/upload/ckfinder/files/gakozesoni.pdfIn PDF document text
- https://muguet.fr/sites/default/files/file/53837616046.pdfIn PDF document text
- http://chuanghuilaw.com/filespath/files/20210910105232.pdfIn PDF document text
- https://telorgabus.com/contents/files/1847359976.pdfIn PDF document text
- http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3c59ab26---fidukinu.pdfIn PDF document text
- http://mzch.pl/userfiles/file/xovopalajof.pdfIn PDF document text
- https://signos.larrialdiak.es/files/galeria/files/1509821471.pdfIn PDF document text
- http://leylatoprak.com/userfiles/file/39541043129.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=messenger+call+recorder+for+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_off0000db4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB4F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f366.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF366	10544 bytes
SHA-256: `3197fa1381d2838b43596f8b384d2e5538043bdcea251a72c33769da9dcfe7f3`
`font_02_sfnt_off00010b48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B48	18528 bytes
SHA-256: `0c4bf7854a5e48bd667219de77b6501f789635cd6242f96e432396147eb4a63c`

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