PDF malware analysis — malicious · 6e04001cf29bfd2a

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 11:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 0bb736f4443d6a9b662d0048b373bae4 SHA-1: f62cc5f47b306b78699590a8fa6747e7dfe35086 SHA-256: 6e04001cf29bfd2a555e1016112ead4d7e8ecfaf854eac4a6b5a7e9363e76368

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The PDF contains numerous external URIs and is structured as a link farm, indicating an attempt to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to facilitate initial access via spearphishing, leading to further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 https://rintrans.com/files/dikivupezateged.pdf In PDF document text
- https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/lbnrcnpv9hqng5dpltd625c1f1/53195956245.pdfIn PDF document text
- http://contelex.it/userfiles/files/81306195715.pdfIn PDF document text
- https://ganport.pl/userfiles/file/36355905139.pdfIn PDF document text
- https://gaadalagi.com/contents/files/rotuwalavanubib.pdfIn PDF document text
- https://ww150004.linebot.net/upfile/files/20210913123350.pdfIn PDF document text
- https://luatsubienhoa.com/upload/ck/files/junerubamobafezivi.pdfIn PDF document text
- http://police8coop.com/UserFiles/file/43501238007.pdfIn PDF document text
- https://traveletrust.com/basefile/traveletrustcom/files/lowot.pdfIn PDF document text
- http://flashdisplay.net/UploadFiles/FCKeditor/20210907122051.pdfIn PDF document text
- http://appinaris.net/ckfinder/userfiles/publics/files/nopig.pdfIn PDF document text
- https://mimpishio.com/contents/files/nigoke.pdfIn PDF document text
- http://www.injamal.es/nueva/ckfinder/userfiles/files/44597786546.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/94137366895.pdfIn PDF document text
- https://activsport.ro/userfiles/file/24490195534.pdfIn PDF document text
- http://dishandspoonproductions.com/ckfinder/userfiles/files/67094293485.pdfIn PDF document text
- http://cu-mbc.com/ckfinder/userfiles/files/toxitamoreleba.pdfIn PDF document text
- http://hwayoung.kr/upfile/files/76342181839.pdfIn PDF document text
- https://cs168.tw/upfiles/editor/files/jadesajunebagif.pdfIn PDF document text
- https://ontogepszerviz.hu/editor_up/tajilarafonetujavin.pdfIn PDF document text
- http://www.afurg.com.br/assets/ckfinder/userfiles/files/99465462937.pdfIn PDF document text
- http://kammatrans.com/userfiles/files/semokigifep.pdfIn PDF document text
- https://familienbilstrup.dk/userfiles/file/tusugexowat.pdfIn PDF document text
- https://daqing-jewelry.com/uploads/files/202109110718442336.pdfIn PDF document text
- http://lab4050.com/upload/editor/file/suzifegubofugi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=schichtplaner+app+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_off0000c46f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC46F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC81	17276 bytes
SHA-256: `b7a53aca8eda3e5736f210b30365d954c2cca30b84f5f91fccaead996c2a76c7`
`font_02_sfnt_off00010907.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10907	10516 bytes
SHA-256: `ca53b795d5395e1a9a4f756a650a04c8070c1502e6fdf47e7960763517d2ad5d`

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