PDF malware analysis — malicious · 8de766d81699156c

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 01:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 7beff0e616598cb22e880f5f5f32bd8e SHA-1: a8c2106261ff624585a29af49ea26405e347074b SHA-256: 8de766d81699156cb2a17c83e5593c5094b06e3bc83a1b91af0b969cc5de9f07

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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 https://www.creativetalentnetwork.com/ckfinder/userfiles/files/lakigasojizefuvu.pdf In PDF document text
- http://adhunikjewellers.com/ckfinder/userfiles/files/22231814428.pdfIn PDF document text
- https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1ff99d16f6a9598b946af9204a8ce26f/62488105359.pdfIn PDF document text
- http://www.udelimpa.es/ckfinder/userfiles/files/3048240894.pdfIn PDF document text
- https://chachachat.info/js/ckfinder/userfiles/files/zukufowamulenanezexiwa.pdfIn PDF document text
- http://minerva-collection.net/files/files/wesulesibipaka.pdfIn PDF document text
- http://abwingsbuffalo.com/uploads/files/sutoxusalis.pdfIn PDF document text
- http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/fuwibazu.pdfIn PDF document text
- https://nezrenpin.com/calisma2/files/uploads/65775591101.pdfIn PDF document text
- https://phnews.ro/files/file/39928914338.pdfIn PDF document text
- http://hotelborgodeipoeti.com/userfiles/files/segitokufidedowizomof.pdfIn PDF document text
- https://shturnev.com/files/foFKED/file/10681009877.pdfIn PDF document text
- http://speaklifeiamgreatness.com/files/files/20933470961.pdfIn PDF document text
- https://ist-lb1.istanajp.com/contents/files/9402617306.pdfIn PDF document text
- http://www.jacenter.org/js/ckfinder/userfiles/files/44408742469.pdfIn PDF document text
- http://alianzablue.com/aym_image/files/5804155085.pdfIn PDF document text
- https://alirezamirmohammadi.com/images/upload/files/taririka.pdfIn PDF document text
- http://abwrichmond.com/uploads/files/6761635503.pdfIn PDF document text
- http://arredamenticucinesiciliane.it/userfiles/files/69043639539.pdfIn PDF document text
- https://nyirfa.hu/uploads/files/popedemabuxaru.pdfIn PDF document text
- http://prmakeup.com/Image/files/winufevuza.pdfIn PDF document text
- http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/pesigeparinanudumo.pdfIn PDF document text
- http://pamatudarbai.lt/ckfinder/userfiles/files/44818013709.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+lion+king+2019+full+movie+123moviesPDF 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_off0000b279.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB279	17328 bytes
SHA-256: `a282b47478b34a8293151f8cfa331d6ceb99fa6b80eb823622f2e308bf0cb2f1`
`font_01_sfnt_off0000df29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF29	11156 bytes
SHA-256: `8cb6e2b1f4636564f4c3a771a6fd12fd2a1243fa5d8124122684d87e5ce6c65a`
`font_02_sfnt_off0000f930.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF930	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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