PDF malware analysis — malicious · 45be2c29fd25b224

MALICIOUS

PDF

86.0 KB Created: 2021-09-12 20:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: efe1ef01fe92fa75210d3dc4f78c1ca3 SHA-1: b7b43d46af2004f4a7346e68635caec4d3e3e740 SHA-256: 45be2c29fd25b224981cac5b88fc7dbab5cd38a6f6dea54074177d3ee17c797f

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. This script likely redirects the user to external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics. The presence of numerous links to PDF files on various domains, coupled with the ML_NYX_PDF_MALICIOUS and ClamAV detections, strongly suggests a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://4998horo.gmmwireless.com/contents/files/getemaw.pdf In PDF document text
- http://music-summer-courses.eu/upload/files/nopozukasowevereganotepux.pdfIn PDF document text
- http://carlaschroyen.com/content_docs/4664869855.pdfIn PDF document text
- http://dioblina.eu/userfiles/file/89609069066.pdfIn PDF document text
- http://eternalcycle.com/FCKFiles/file/70671140557.pdfIn PDF document text
- http://szkolka-wiercioch.pl/files/file/45024291967.pdfIn PDF document text
- https://www.studiorosaliabusco.it/ckfinder/userfiles/files/69057906146.pdfIn PDF document text
- http://madiagranitosilano.it/userfiles/files/narepekolux.pdfIn PDF document text
- http://www.sauminandy.com/fckimages/file/94888555555.pdfIn PDF document text
- http://como.gattinonimondodivacanze.it/themes/userfiles/files/susabatagitagolesusibod.pdfIn PDF document text
- https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/187eecb56fde35b111871666d62ab999/45881303373.pdfIn PDF document text
- http://benthanhsgfarm.net/images/uploads/files/42205403149.pdfIn PDF document text
- http://paoladebenedetti.eu/userfiles/files/kukijezenafur.pdfIn PDF document text
- https://et-auditing.com/userfiles/files/21328258663.pdfIn PDF document text
- http://ih-consultant.com/ckfinder/userfiles/files/51706076703.pdfIn PDF document text
- https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210908011923.pdfIn PDF document text
- http://cokhilegia.com/upload/files/28860850250.pdfIn PDF document text
- http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210908235607.pdfIn PDF document text
- http://insightonafrica.in/userfiles/file/nurixigevivaler.pdfIn PDF document text
- http://dopuskvsro.ru/UserFiles/75409838905.pdfIn PDF document text
- https://birgatour.mn/js/ckfinder/userfiles/files/50430662315.pdfIn PDF document text
- http://jysfh.com/upload_fck/file/2021-9-3/20210903202827831975.pdfIn PDF document text
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311d5eae358---10845645820.pdfIn PDF document text
- http://jfhcoaching.nl/userfiles/files/2179382025.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+special+effects+app+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_off0000e9f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9F1	18468 bytes
SHA-256: `a3c0df89417eac1b606c6b3f473f58a19c0cf96bc8116c59a926beb2adf193a0`
`font_01_sfnt_off00011967.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11967	10668 bytes
SHA-256: `887f292f701c2b91211cba20a3fb20040d3bc9b3d04575a6e2410279fa14d083`
`font_02_sfnt_off000131fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131FC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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