PDF malware analysis — malicious · b1ffe5955b005a80

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 10:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 0ad85fda41f4e9c86a3ab2d244d7e847 SHA-1: b123081060a65b988f57f656c366392395a17046 SHA-256: b1ffe5955b005a8039e9b08468972a457cc1f1da58c436a62659662e7a2ab145

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign, likely aiming to direct users to malicious websites. The ClamAV detection and ML classifier further confirm the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://krisoc.ru/uplcv?utm_term=top+android+market PDF link annotation
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0626aa668---demefotok.pdfIn PDF document text
- http://thesecurityguardunion.ca/userfiles/files/lilanazitodirewi.pdfIn PDF document text
- http://klhl.com/userfiles/file/xopep.pdfIn PDF document text
- http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161334a39ed67c---63202077080.pdfIn PDF document text
- http://jshtextile.com/UserFiles/file///napimikamux.pdfIn PDF document text
- http://art-lan.ru/uploads/assets/file/posibobizusopotutejifab.pdfIn PDF document text
- http://ingore.cn/upload/files/30855463322.pdfIn PDF document text
- http://dissanna.com/temp/fckeditor/file/6960125652.pdfIn PDF document text
- https://leuphuotcamap.com/uploads/image/files/jowip.pdfIn PDF document text
- https://bokaichenyu.com/upload/files/fanibemipa.pdfIn PDF document text
- http://sunil.kr/uploadfile/fckeditor/file/lopamomafaxijuko.pdfIn PDF document text
- http://holzbau-napetschnig.at/93844680627.pdfIn PDF document text
- http://nataliashishkina.com/userfiles/file/visumuzigasepezisetevoxu.pdfIn PDF document text
- http://lasantitosrestaurant.com/userfiles/file/40109872119.pdfIn PDF document text
- http://pitin-akutsu.com/js/upload/files/fenogapav.pdfIn PDF document text
- http://komputerzagrosze.pl/userfiles/file/xugozopamewugidajupox.pdfIn PDF document text
- http://boden.boj.se/uploads/userfiles/files/bezunageforaxunibukatu.pdfIn PDF document text
- http://hutnia.pl/userfiles/file/20472286064.pdfIn PDF document text
- http://fuku-zou.com/userfiles/file/34398522301.pdfIn PDF document text
- http://aokisuper.com/ckfinder/userfiles/files/xevutun.pdfIn PDF document text
- https://apartmani-mestrovic-krk.hr/files/52818033319.pdfIn PDF document text
- http://imhyuk.com/imhyukeditor/userfile/file/26233238811.pdfIn PDF document text
- https://galaxytraining.examinationonline.com/files/sajojofitefukakototi.pdfIn PDF document text
- http://dirpub.org/editor/ckfinder/userfiles/files/96757274825.pdfIn PDF document text
- https://thanaclusterwestgate.leaddeehub.com/userfiles/files/wekuposagufojorubifi.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_off0000dd24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD24	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f536.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF536	17132 bytes
SHA-256: `a99b742e745806858d16b5c14d10ae0e0f0e7ed09db0f744b3f60029a2d91997`
`font_02_sfnt_off000121c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121C3	10396 bytes
SHA-256: `14ce479b905d3a118bd9b6ff3ff40fcd38f74ec417e2530fabc2d55744314607`

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