PDF malware analysis — malicious · 4fa0ce4a70abc838

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 06:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 90f3dca00a4658bdb94b25b249e8c93c SHA-1: e2c475ed46d806a60f2c2226289ccec7cdbaceb6 SHA-256: 4fa0ce4a70abc83894600c5ac12bd75f793ae363cbd6580e4dfd453bdec5bf48

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of SEO poisoning or distribution of further malicious content through these links.

Machine Learning

Nyx PDF Classifier malicious score 0.8438

Heuristics 6

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.
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://newtech-utm.pl/userfiles/file/nowolezasipuk.pdf In PDF document text
- http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/47682639944.pdfIn PDF document text
- http://makinsushi.com/uploads/files/38428065751.pdfIn PDF document text
- http://globomax.eu/userfiles/file/61206978000.pdfIn PDF document text
- http://zulassung4you.de/bilder/file/legux.pdfIn PDF document text
- https://biorenta.lt/ckfinder/userfiles/files/85197969198.pdfIn PDF document text
- https://nonbodepsg.com/uploads/files/73843144443.pdfIn PDF document text
- https://nnkcreations.com/userfiles/file/wedofikoxanuridazejapud.pdfIn PDF document text
- http://mevlanaasm.com/resimler/files/karoduvutipaju.pdfIn PDF document text
- http://savitaco.com/uploads/images/files/mivumewe.pdfIn PDF document text
- http://businessvaluationapp.com/fck_files/file/24881091216.pdfIn PDF document text
- https://jotelek.hu/files/file/barakaxesesuwigekadus.pdfIn PDF document text
- http://patanjali.zohukum.com/ckfinder/userfiles/files/seziwoxukitepinaxebev.pdfIn PDF document text
- http://cesarrodarte.com/userfiles/file/venomodaredefobi.pdfIn PDF document text
- https://creteotels.gr/FCKeditor/userimages/file/23662703140.pdfIn PDF document text
- https://dalycity.com/wysiwygfiles/file/ligidap.pdfIn PDF document text
- http://silverspringabw.com/uploads/files/bebeni.pdfIn PDF document text
- https://rhuyscampingcar.fr/images/files/48767332052.pdfIn PDF document text
- http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/perarim.pdfIn PDF document text
- https://bankubezpieczen.pl/userfiles/file/boledupepef.pdfIn PDF document text
- http://teusz.pl/UserFiles/file/tamesozijozefuxanavefude.pdfIn PDF document text
- http://autofox.lt/ckfinder/userfiles/files/47686613508.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2416274a---vowomugom.pdfIn PDF document text
- https://hitourkorea.com/FileData/ckfinder/files/20210903_100E11DC7E708D68.pdfIn PDF document text
- https://www.tcf.gov.tr/ckfinder/userfiles/files/xameleparojenixijezog.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=video+download+application+for+androidPDF link annotation
- 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_off0000c7f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7F8	19308 bytes
SHA-256: `782e4f4cfcb35177948c2e9fe29d1214c50225a64e56815a13efa9e48d23f426`
`font_01_sfnt_off0000facd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFACD	10500 bytes
SHA-256: `497379747bd18c7dae1dbc1f4ddcaaade9104f02dd1dd37de7be1d9ffa898b19`
`font_02_sfnt_off000112d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112D8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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