PDF malware analysis — malicious · 8f40c77d462cb7d1

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 20:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: d6cacfb54ec86301aa5d2c4b246f7602 SHA-1: b5b1ef06f5337860f8e5f64f464982f275466799 SHA-256: 8f40c77d462cb7d1d10a74249bc84e68f8f59d64936538866596be7339ec6e9a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate this JavaScript is used to redirect to external URLs, and ClamAV detection confirms its malicious nature, classifying it as Pdf.Phishing.Trojan. The numerous extracted URLs, many hosted on disposable domains, suggest a link farm or phishing infrastructure designed to distribute further payloads or lure victims.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://www.mnogotrop.com/ckfinder/userfiles/files/fujojafemuzamil.pdf In PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdce211ec5---robefo.pdfIn PDF document text
- https://my-natural-style.net/upload/files/31856369670.pdfIn PDF document text
- http://www.firstpages.eu/app/webroot/files/userfiles/files/16917426108.pdfIn PDF document text
- http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/lifizimir.pdfIn PDF document text
- http://a-pro-peau.fr/userfiles/file/rowusutusuredax.pdfIn PDF document text
- http://solyaris.pro/admin/ckfinder/userfiles/files/56784770809.pdfIn PDF document text
- https://onhimalayas.com/ckfinder/userfiles/files/sisukelulefebisone.pdfIn PDF document text
- https://www.sensiblemachines.com/ckfinder/core/connector/php/files/5184330542.pdfIn PDF document text
- http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/wogigudaz.pdfIn PDF document text
- http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/89489122274.pdfIn PDF document text
- http://st03.it/userfiles/files/wewenojavusope.pdfIn PDF document text
- http://vincitydata.com/uploads/ckfinder/files/89306089632.pdfIn PDF document text
- http://af.ssla.ru/images/fornews/files/xadebujenivomorura.pdfIn PDF document text
- http://apicn.net/upload/files/65686448480.pdfIn PDF document text
- https://alaskaproauto.net/nbloom/fckuploads/file/bubikeboniravoj.pdfIn PDF document text
- https://genegurumiraclehealer.com/userfiles/file/xepati.pdfIn PDF document text
- https://pixel.bg/img/file/zejopuwununo.pdfIn PDF document text
- http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ziropuzomomo.pdfIn PDF document text
- https://fonixkoncert.hu/upload/file/8019212429.pdfIn PDF document text
- http://antropolog.ru/userfiles/file/29538803559.pdfIn PDF document text
- http://vonschickenfremont.com/uploads/files/tudusinizeg.pdfIn PDF document text
- http://idrogastermoclima.it/Utentifile/FCKPage/file/56948543111.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+harley+davidson+wallpaper+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_off0000ddd0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDD0	10740 bytes
SHA-256: `f82ef70c5f47143dec3d4c34bbee407e41c8334aeb31c4482fb76cf576dd838a`
`font_01_sfnt_off0000f66f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF66F	17200 bytes
SHA-256: `1a3544e655a5dcdbb83eea84d0de2f43bea2a3af837884640d5d8912fadd5510`
`font_02_sfnt_off00012336.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12336	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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