PDF malware analysis — malicious · 639220fe589a38bd

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 06:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 0e15304f33fff7af789eb34dfd5c2843 SHA-1: c4cce7f39b312ae5cd4e191642298a0e56a590e9 SHA-256: 639220fe589a38bdde21388d52df365e2d85a47b2614f3bbdaa15d4f212c7e8e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to redirect to malicious content. The PDF also contains an embedded JavaScript stream, which could be used to exploit vulnerabilities or further facilitate malicious activity.

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 https://chcial.ru/uplcv?utm_term=ahnlab+antivirus+android PDF link annotation
- https://hetodon.com/fckeditorfiles/file/pezajukijet.pdfIn PDF document text
- http://wcsps.com.tw/ckfinder/userfiles/files/bugivarafejadaki.pdfIn PDF document text
- https://elger.cz/fckphotos/file/50971937869.pdfIn PDF document text
- http://teleinwestor.com/userfiles/file/32267865676.pdfIn PDF document text
- http://coolscape.info/images/files/pomujopadumov.pdfIn PDF document text
- http://cuacuontoanthang.com/media/file/75110985586.pdfIn PDF document text
- http://markasib.ru/ckfinder/userfiles/files/kezetirudiboloreg.pdfIn PDF document text
- http://gonzagafood.com/userfiles/files/3746608605.pdfIn PDF document text
- http://hndgyl.com/v15/Upload/file/2021910418501859.pdfIn PDF document text
- http://schule.havonix.com/ckfinder/userfiles/files/27030716786.pdfIn PDF document text
- https://memorybg.net/app/templates/js/ckfinder/userfiles/files/zaxedusababifipopasen.pdfIn PDF document text
- http://bsp-oblspl.org/ckfinder/userfiles/files/jijadotuziwib.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9ff4f1f3---newezivitefedanajufaxomug.pdfIn PDF document text
- https://phucatgarment.com.vn/ckfinder/userfiles/files/gubewiruwomeli.pdfIn PDF document text
- http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/rexawofewi.pdfIn PDF document text
- http://jjburgerut.com/uploads/files/46425906764.pdfIn PDF document text
- http://immobilieninvestors.eu/userfiles/file/modewupinazeboboje.pdfIn PDF document text
- http://mauchlineware.com/html/chapelstreet/web/userfiles/files/37315520417.pdfIn PDF document text
- http://eviljoy.com/UserFiles/File/13847020615.pdfIn PDF document text
- https://khachsan295doson.vn/namthuan/images/news/files/banatodibadena.pdfIn PDF document text
- http://pcwenhua.com/uploadimg/file/16315603672021541394.pdfIn PDF document text
- http://bloemenwinkelindex.nl/images/uploads/pewusokusafuzazigufogo.pdfIn PDF document text
- http://a9188.com/upload_files/art_files/files/20210905_193658.pdfIn PDF document text
- http://zeguvietnam.com/uploads/ckfinder/files/sodukepuvitupomafejub.pdfIn PDF document text
- 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_off0000e0d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0D1	17428 bytes
SHA-256: `73790292fcde93643d67ea3d0afd06526a160960cb0e182d8f6882db048c08cd`
`font_01_sfnt_off00010e13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E13	10500 bytes
SHA-256: `a1804689fd164b20860a098217b282a376169401d003bca2faf31664707ef7ee`
`font_02_sfnt_off000125e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125E1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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