PDF malware analysis — malicious · 870dfc0d939b84e6

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 22:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: aefa635f48926252208883b15b052030 SHA-1: 69b16e565b54cc6d769ef61885b3326f511a8bff SHA-256: 870dfc0d939b84e67cdcf53d678d1ca3c2a705471317cb270b77bcced6989abd

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JS points to T1059.007, and the overall nature of the PDF suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://netmode.net/app/webroot/uploads/files/72023923643.pdf In PDF document text
- http://zuche0551.com/upload/file/17109944025.pdfIn PDF document text
- http://onlinetalk.jp/app/webroot/img/fckfiles/file/70658439771.pdfIn PDF document text
- http://tipkeo.com/js/ckfinder/userfiles/files/78134732620.pdfIn PDF document text
- http://studiolegaletrotta.eu/userfiles/files/rifatigi.pdfIn PDF document text
- http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/mujijoxigaxupifexipav.pdfIn PDF document text
- http://www.dkmodels.net/ckfinder/userfiles/files/68728461122.pdfIn PDF document text
- http://daiichibus.vn/uploads/news_file/kuranesedirojipa.pdfIn PDF document text
- http://haai.org/upload/file/82684960238.pdfIn PDF document text
- http://adice-area.com/pictures/files/jotewugaropebodije.pdfIn PDF document text
- http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/4922462431.pdfIn PDF document text
- http://marta-galan.com/files/varios/file/8683263217.pdfIn PDF document text
- http://bifruit.mk/ckfinder/userfiles/files/giximagigivagekomo.pdfIn PDF document text
- https://inprovitperu.com/ckfinder/userfiles/files/kovomanafek.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c92fb331d9---97485497225.pdfIn PDF document text
- http://mos-craciun-inchiriere.ro/fckfiles/file/79489356092.pdfIn PDF document text
- https://businesslife.com/content/file/72304122244.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8776572e5---99011254652.pdfIn PDF document text
- http://ozkayalarlojistik.com/userfiles/file/62781571697.pdfIn PDF document text
- http://intertexmedical.com/userfiles/files/76110881665.pdfIn PDF document text
- https://khonggiansachhanoi.vn/uploads/files/famokozilulomu.pdfIn PDF document text
- https://apz-arte.com/ckfinder/userfiles/files/dolopipilaliwukinozudure.pdfIn PDF document text
- https://clinicamanila.com/ckfinder/userfiles/files/53051604869.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=street+dancer+3d+full+movie+online+playPDF 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_off0000e547.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE547	17164 bytes
SHA-256: `a449179b7c34be96d9552b9824eb3d13c6aee58ece6aab0edd4f22f0dad1b2cd`
`font_01_sfnt_off000111d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111D2	11140 bytes
SHA-256: `8871731eca6ea43db3ab9060791c17f434db053263b0b06d03a452e1281e0b7c`
`font_02_sfnt_off00012be8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BE8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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