PDF malware analysis — malicious · a67839fc013e010b

MALICIOUS

PDF

81.9 KB Created: 2021-09-23 19:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 8331b32ef914bc99cf38006f50d9b4d7 SHA-1: 6ab167d0d5159243e056f7c12afdbed29ea6e249 SHA-256: a67839fc013e010bdacb3126e8df539874e50cab19b1643d6740844d11d0010a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a large number of external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm on disposable hosting, likely to distribute malicious content or phish users. The embedded JavaScript stream further supports the execution of malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=old+play+store+games PDF link annotation
- https://bitree.com/ckfinder/userfiles/files/32954847092.pdfIn PDF document text
- https://xn--80aesyq.xn--p1ai/files/file/nazuwibedejupuw.pdfIn PDF document text
- https://mi-stores.com/basketballtotaal/images/editor/file/wivitukalujufuse.pdfIn PDF document text
- https://nocnepal.org.np/ckfinder/userfiles/files/13144774407.pdfIn PDF document text
- https://goldmenu.com/userfiles/file/81040916860.pdfIn PDF document text
- http://moskvaznaet.ru/upload/files/tizixedefovevu.pdfIn PDF document text
- http://tajeer.co/userfiles/file/bubekinifoduruzixakevo.pdfIn PDF document text
- http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ridaximebimesajoje.pdfIn PDF document text
- http://dynamic1984.com/user_file/file/zezetadaxawifamopiz.pdfIn PDF document text
- https://perfecthospital.net/FCKeditor/file/kumupafogulosili.pdfIn PDF document text
- http://christopherdallo.com/file/87262392830.pdfIn PDF document text
- https://birotex.rs/images/files/64665949481.pdfIn PDF document text
- https://fu-ko-property-agency.com/webroot/editor-uploads/files/voraxokujosi.pdfIn PDF document text
- http://kisito.com/userfiles/file/68435576128.pdfIn PDF document text
- http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/27219418971.pdfIn PDF document text
- http://diadiemvui.com/upload/files/14375670142.pdfIn PDF document text
- https://abcoegypt.com/userfiles/files/mamidazopofisidigun.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d1a4048f3---narivodulanifolujaziwa.pdfIn PDF document text
- http://laclonghotel.vn/upload/files/71294792501.pdfIn PDF document text
- https://ginniglobal.com/uploads/file/60125778575.pdfIn PDF document text
- http://sreema.org/FCKeditor/file/digelobivowem.pdfIn PDF document text
- http://engelholm.boj.se/uploads/userfiles/files/8757594177.pdfIn PDF document text
- http://oldstat.ww.tj/img/file/68887320086.pdfIn PDF document text
- https://luatsuavina.com/userfiles/file/28521953592.pdfIn PDF document text
- https://derechosenred.org/aym_image/files/jobanefiwoganojezi.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_off0000da89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA89	10676 bytes
SHA-256: `cd6bdd57874601c70cbeac8b69e2e2a0563917b810cad58f762a4124ef21de6b`
`font_01_sfnt_off0000f2ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2EE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010b00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B00	18628 bytes
SHA-256: `4cec0a0edc7400cbc19526fb50aa9283e186ac3ecf2df3242c144bbc0c6687a8`

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