PDF malware analysis — malicious · c690e4a17f320805

MALICIOUS

PDF

73.1 KB Created: 2021-09-26 11:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 47252bd508c148ee48c4598cd3c35276 SHA-1: 9053ab7366782144a670c1a3ed2a06914233a262 SHA-256: c690e4a17f32080525c259e863bc21567b731414a5fca6f6aaee93e74531fb1a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with critical and high severity heuristics indicating its nature. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users to potentially malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent.

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.
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://dulichtantai.com/files/uploaded/files/26044211432.pdf In PDF document text
- https://rosanaalvarracin.com/userfiles/file/2515943055.pdfIn PDF document text
- http://atomicattack.com/atomic/fckimages/file/15289221394.pdfIn PDF document text
- https://allmassage.net/upload/file/20210915190851.pdfIn PDF document text
- https://winstar-tools.com/UserFiles/editor/file/86955191844.pdfIn PDF document text
- https://lajovisena.com/gallery/file/bepabumixapinigodolajoni.pdfIn PDF document text
- http://movitecnic.fr/ressource/site-image/files/jekowaxus.pdfIn PDF document text
- http://smwiarus.pl/ckfinder/userfiles/files/mogewoligosemobogarigu.pdfIn PDF document text
- http://jr.ac.th/ckfinder/userfiles/files/13247675407.pdfIn PDF document text
- http://alothongtin.com/upload/FCK/file/nivigegukosamizirub.pdfIn PDF document text
- http://aadcnfgl.netsociality.com/upload/files/jokidusipepakoremalanuli.pdfIn PDF document text
- http://federicozucchettiarchitetto.eu/userfiles/files/rubinefiganan.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149660899c7b---70346842947.pdfIn PDF document text
- http://hasadtemizlik.com/upload/file/21439818609.pdfIn PDF document text
- http://pitin-akutsu.com/js/upload/files/25764347107.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374339f3200---xetenefesowugo.pdfIn PDF document text
- http://hoteldarim.ir/basefile/hoteldarimir/files/91281503846.pdfIn PDF document text
- https://raovat72.vn/uploads/news_file/60968115347.pdfIn PDF document text
- https://rcvizovice.cz/ckfinder/userfiles/files/safokogugisajavufibezan.pdfIn PDF document text
- http://gallery4walls.com/upload/editer/file/20762278163.pdfIn PDF document text
- https://uzmanwebci.com/calisma2/files/uploads/3887534053.pdfIn PDF document text
- http://dlugopis.kbo.pl/ckfinder/userfiles/files/zetibubudenitotidu.pdfIn PDF document text
- http://df-2.de/images/daten/file/rokonodisowupobopa.pdfIn PDF document text
- http://s-pack.kr/userfiles/file/20210926172713.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+activate+text+to+speech+on+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_off0000b498.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB498	10812 bytes
SHA-256: `664136eb4e0b307293bfabb8ade7782113e0cb61a2e3ad92cc5b16293547b732`
`font_01_sfnt_off0000cd86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD86	18800 bytes
SHA-256: `cbfb8df22cef0c59f820fd9893fbbf1d73d9b75c2ac04b846d44793295d6b783`
`font_02_sfnt_off0000fe40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE40	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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