PDF malware analysis — malicious · cb9fd5bec6e9b25f

MALICIOUS

PDF

78.9 KB Created: 2021-09-23 08:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 6614341b63dbf93430a394f44d142e41 SHA-1: ca212b300fb0e6577cf1c725132f9d0b28888d3f SHA-256: cb9fd5bec6e9b25f3b1def2c33ad530abc82b1456644b302f5eb78686936fdf5

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs and a heuristic indicating a link farm, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

Heuristics 6

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.
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://cructi.ru/uplcv?utm_term=cryptotab+browser+pro+mine+on+a+pro+level+apk+download PDF link annotation
- http://focalthai.com/file_media/file_image/file/saxibovujipafadaz.pdfIn PDF document text
- http://philipp-haberland.de/images/upload/file/12138122297.pdfIn PDF document text
- https://greenlakecruises.com/ckfinder/userfiles/files/33954616309.pdfIn PDF document text
- http://phongkhamthienhoa.org/images/files/5195838733.pdfIn PDF document text
- https://lolakarimova.uz/ckfinder/userfiles/files/gofowanufimu.pdfIn PDF document text
- https://hojoairport.com/images/file/84159222635.pdfIn PDF document text
- http://yourbuilding.ru/userfiles/files/naderojizovo.pdfIn PDF document text
- http://joyandwowbook.com/upload/file/kutemizadonum.pdfIn PDF document text
- http://ciaooo.ru/uploades/userfiles/file/lolojosanogoxo.pdfIn PDF document text
- http://extintoresorigen.com/images/editor/lasuloneraxopile.pdfIn PDF document text
- http://mkpstroitel.ru/upload/files/71377062687.pdfIn PDF document text
- http://suachuaspa.com/upload/images-content/files/sivulole.pdfIn PDF document text
- http://elite-nails.pl/Upload/file/48946452140.pdfIn PDF document text
- http://holidayservicemarsala.it/userfiles/files/72603013080.pdfIn PDF document text
- http://autosoftware.company/autoresponders_images/files/13883527135.pdfIn PDF document text
- https://www.cascatai.com.br/ckfinder/userfiles/files/joxevixitilafawufug.pdfIn PDF document text
- http://epmachine.ru/d/files/toguvovelawajeguwigiwi.pdfIn PDF document text
- https://abhrian.com/userfiles/files/sobivenebozudosew.pdfIn PDF document text
- http://luxcottage.ru/stroykamen/userfiles/files/59186067591.pdfIn PDF document text
- https://ispartaorganizasyon.com/ckfinder/upload/files/86494780242.pdfIn PDF document text
- http://zentrumok.com/userfile/files/76154943600.pdfIn PDF document text
- http://membranekeyboard.pl/_data/file/tovusozenizugiso.pdfIn PDF document text
- http://cerrutistudio.eu/userfiles/files/53803183017.pdfIn PDF document text
- http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/67319902086.pdfIn PDF document text
- http://davidhammerstein.org/userfiles/file/27817443413.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_off0000cde0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDE0	17948 bytes
SHA-256: `1efc89f24507f205413e74143ebbca89626c73edf9b2aa281ca75bb663ac08b6`
`font_01_sfnt_off0000fc26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC26	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001143d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1143D	11084 bytes
SHA-256: `a8508a3df214282d674e0af5101401ff31c6578381546ab1e3b3b239bc376149`

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