PDF malware analysis — malicious · 3a39bb0001a77a6b

MALICIOUS

PDF

77.4 KB Created: 2021-09-15 20:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: f69589a71b002c1318e5277998882976 SHA-1: 95c240c760807c0d14c2e7bb3bd543d0cc174d2a SHA-256: 3a39bb0001a77a6b7bf47e847824c66f0f405d3aadfd230166250a53f52e09be

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is flagged as malicious by ML classifiers and ClamAV. This script likely redirects the user to external URLs, as indicated by the PDF_URI heuristic and the numerous extracted URLs. The presence of a link farm on disposable hosting further suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. 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://crysiq.ru/uplcv?utm_term=aex+redmi+5a PDF link annotation
- http://air-ned.com/uploads/files/konojabuzujorusogem.pdfIn PDF document text
- https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6a55a6e8b---75221937758.pdfIn PDF document text
- https://highlander-inn.com/assets/userfiles/files/fidodinujibusabe.pdfIn PDF document text
- https://dildendilecevirievi.com/upload/ckfinder/files/mumititivumiletoxugagem.pdfIn PDF document text
- http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/5646982163.pdfIn PDF document text
- http://zoldjogsi.hu/uploads/files/82512431160.pdfIn PDF document text
- http://auswallendorf.de/userfiles/file/koraxolik.pdfIn PDF document text
- http://15449010.com/FileData/ckfinder/files/20210911_3D5BECC297B27759.pdfIn PDF document text
- https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/33eda1d8f954913a4bd4fb0feab1e657/40517723837.pdfIn PDF document text
- https://smshealthcareservices.com/ckfinder/userfiles/files/1087580797.pdfIn PDF document text
- http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18436481267.pdfIn PDF document text
- http://21cedu.com/pds/userfiles/files/mufeligigejidekipe.pdfIn PDF document text
- https://108pizza.pl/uploads/userfiles/files/diwugedovuwemewiwesap.pdfIn PDF document text
- http://abwalabamaave.com/uploads/files/48140328678.pdfIn PDF document text
- http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/62851137403.pdfIn PDF document text
- https://searchlink.org/userfiles/file/vutelilefu.pdfIn PDF document text
- http://regcureguide.com/files/files/58201850660.pdfIn PDF document text
- http://hlqh.net/userfiles/file/20210913152017_1491505948.pdfIn PDF document text
- https://jooli.ru/ckfinder/userfiles/files/91429242173.pdfIn PDF document text
- http://coomargroup.com/ckfinder/userfiles/files/sojokobekataxutititoxexut.pdfIn PDF document text
- http://classtool.info/upload/files/60371970462.pdfIn PDF document text
- http://blueview.nl/app/webroot/files/userfiles/files/lizebakapakizetilesem.pdfIn PDF document text
- http://bk-plus.at/userfiles/files/duwirililamabam.pdfIn PDF document text
- http://dienhoabacninh.vn/webroot/img/files/bawojewixelitovopononipin.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_off0000c96c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC96C	10088 bytes
SHA-256: `d66c0855287d54ddbff03f7d5d7393e1159b3379f5fadfa25352065cb10780c3`
`font_01_sfnt_off0000dfed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFED	18348 bytes
SHA-256: `5256904bc7d9eb865aca987c25465be65349003fb1e524e42f6864773663d69e`
`font_02_sfnt_off00010fe0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FE0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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