PDF malware analysis — malicious · 6c4048f0e766abde

MALICIOUS

PDF

67.2 KB Created: 2021-10-01 15:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 032ca7a1f56a9ff94f5a318bf581583e SHA-1: e6fa73c8d14c281da57a01aa628d8473afd84408 SHA-256: 6c4048f0e766abde799967a2926e744180455762079ff84038ee9391ac312328

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It employs a common phishing lure technique, presenting a screenshot to obscure clickable links. The embedded JavaScript and numerous external URIs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9966

Heuristics 7

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE

PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
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://medvor.ru/uplcv?utm_term=emoji+ios+14+download+for+android PDF link annotation
- http://archbot.pl/files/file/xudupediriron.pdfIn PDF document text
- http://lamelove-zakryti.cz/userfiles/file/gogimikomop.pdfIn PDF document text
- http://vikohasanfiber.com/upload/files/94680321235.pdfIn PDF document text
- https://absoger.bmv-communication.fr/uploads/files/15093264954.pdfIn PDF document text
- http://zzquansu.cn/d/files/pizowuzuwawiwuzolotegor.pdfIn PDF document text
- http://trevelsi.ru/ckfinder/userfiles/files/rikowinukotexo.pdfIn PDF document text
- http://kirsanov-maslo.ru/uploads/35875407837.pdfIn PDF document text
- http://wawa757.com/uploads/files/fofakulowexapuwipelola.pdfIn PDF document text
- http://www.peritaonline.es/ckfinder/userfiles/files/tizunozijozasolotedoxes.pdfIn PDF document text
- https://apgr.eu/UserFiles/file/78693005335.pdfIn PDF document text
- https://rolcsi-bau.hu/userfiles/files/gagogewulelaxekilufub.pdfIn PDF document text
- http://titibbs.xyz/js/ckfinder/userfiles/files/vabegepidujakusime.pdfIn PDF document text
- https://777mto.com/contents/files/mijejurobosasik.pdfIn PDF document text
- http://fiumaradelsossio.it/userfiles/files/wavodokezejiwa.pdfIn PDF document text
- https://swaarm.de/app/webroot/upload/files/99258556134.pdfIn PDF document text
- http://drcleancenter.com/uploads/files/202109260834184509.pdfIn PDF document text
- http://grandioso.asia/editor_upload_image/file/jevakosoxoxog.pdfIn PDF document text
- http://hatdesechia.com/storage/ckfinder/files/89330388260.pdfIn PDF document text
- http://blackhorsesc.pl/userfiles/file/lorerodanoturabifoz.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb362855c1---vonajituferefikivexabiv.pdfIn PDF document text
- http://jpsacademy.com/slbdavbatala/userfiles/file/47319579180.pdfIn PDF document text
- http://robotsuk.com/luckingbros.co.uk/userfiles/files/57011881471.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_off0000ac6c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAC6C	14004 bytes
SHA-256: `22f8045b47f086380d4b203b3d2c9d1dd4351267c6244aef496f0591f6bee200`
`font_01_sfnt_off0000cf1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF1B	10612 bytes
SHA-256: `0b0c55e329d81aa199c51f9f199b9fc05b330f62710cd7d4bd2da9f99b30fca2`
`font_02_sfnt_off0000e759.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE759	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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