PDF malware analysis — malicious · b58a541fa0d02df4

MALICIOUS

PDF

75.0 KB Created: 2021-03-31 20:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 9bf010d3b18f8b38fe1f281faf00bbf9 SHA-1: 71e60f06b3d05859ca819f372bd85a1d311dbb97 SHA-256: b58a541fa0d02df4d5a7fc60994b9d86a2c4db233b807d6dd2766bfd554ebd46

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with a specific ClamAV detection name of Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0. An embedded URI points to a suspicious URL, 'https://golowaki.ru/award?keyword=calcium+hydroxide+cement+pdf', which is likely used to deliver a secondary payload or conduct phishing. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://golowaki.ru/award?keyword=calcium+hydroxide+cement+pdf
- https://bepixumute.weebly.com/uploads/1/3/5/3/135302933/biwuni.pdf
- https://cdn-cms.f-static.net/uploads/4388825/normal_6044d301bc6f9.pdf
- https://cdn-cms.f-static.net/uploads/4471958/normal_6063ff1e7d894.pdf
- http://nevoxodaw.66ghz.com/758197005.pdf
- https://pevidutapare.weebly.com/uploads/1/3/0/7/130740538/b3442559267.pdf
- https://cdn-cms.f-static.net/uploads/4386828/normal_602b73be169c1.pdf
- http://zivolizukaliwa.iblogger.org/systems_of_inequalities_word_problems_worksheet_answer_key.pdf
- https://cdn-cms.f-static.net/uploads/4366384/normal_603854380a526.pdf
- https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/jajurazajisi-nedikozu.pdf
- http://liruroz.iblogger.org/pizibujugora.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://joxumokuri.epizy.com/rexewimasegoniwokiwove.pdf
- https://s3.amazonaws.com/tezude/melinusababosekekowe.pdf
- http://piwuzodoxomox.epizy.com/print_booklet_from_indesign.pdf
- http://lilivuxaja.rf.gd/27509813296.pdf
- https://s3.amazonaws.com/toliwudalamem/baxexuruwedukoliwabumir.pdf
- http://bakilipos.epizy.com/risaz.pdf
- https://s3.amazonaws.com/fajixe/android_smart_tv_box_argos.pdf
- http://sulorunak.rf.gd/gawobekatowe.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e955.bin` `7f966e9f691cfc0aaede52504955894b6b4c7c9842b5ca10daef294f4c60735c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE955	5292 bytes
`font_01_sfnt_off0000fb30.bin` `96c6707cd536c146dd15891bd531a4bb98e603c0fea87067d47d46015417e0e7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB30	10664 bytes

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