PDF malware analysis — malicious · 0a2674ba147dce16

MALICIOUS

PDF

70.5 KB Created: 2021-09-11 14:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 772b546009d37d03a81737a6e387b290 SHA-1: 95a59e50e1b6d4952f921529088e0d826d28d8d5 SHA-256: 0a2674ba147dce160a827f85a289dc6c311aa29b391156ec4b357b0d279ba1f8

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest the PDF is part of a link farm designed to redirect users to other malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://peak-experience-japan.com/images/blog/file/tosiriwitajewosok.pdf In PDF document text
- https://vas-vill.hu/userfiles/file/vozirilirikures.pdfIn PDF document text
- http://burningspearmarketplace.com/js/ckfinder/userfiles/files/2597496318.pdfIn PDF document text
- http://wakabaeducation.com/userfiles/file/51588255441.pdfIn PDF document text
- http://asr-net.ru/uploads/files/34509653059.pdfIn PDF document text
- https://saikekanglun.com/filespath/files/20210904081310.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/wutejoradubamuzomivawidu.pdfIn PDF document text
- http://esoftland.com/userfiles/file/tazesaraniputabegux.pdfIn PDF document text
- https://willmarareachamber.com/ckfinder/userfiles/files/devomuxuluwoxo.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c634613c2---mafetid.pdfIn PDF document text
- http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630813811.pdfIn PDF document text
- http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/mogipupula.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/h7a96tep3utoajqeq4feep3b3c/bapamojofowave.pdfIn PDF document text
- http://studiomalpocher.it/userfiles/files/wegabow.pdfIn PDF document text
- http://aquamedia.cn/ckfinder/userfiles/files/26223536793.pdfIn PDF document text
- https://morganmethod.com/ci/userfiles/files/84666618800.pdfIn PDF document text
- http://pspectr.ru/userfiles/file/robizoritenubufegeruxo.pdfIn PDF document text
- http://mcserpenti.com/userfiles/file/kofilibadotixalok.pdfIn PDF document text
- http://rld-carbon.ru/file/turajelikase.pdfIn PDF document text
- http://heryeryesil.com/resimlerfiles/nokuderenusomuluze.pdfIn PDF document text
- https://singlespeed-switzerland.ch/userfiles/files/40521060896.pdfIn PDF document text
- http://cateringkieuan.com/uploads/userfiles/file/woxobivuvakobugemosavexe.pdfIn PDF document text
- http://www.giuseppe.ru/ckfinder/userfiles/files/88155691413.pdfIn PDF document text
- https://alzubidi.com/userfiles/files/majuxegevavifiwakekusiziv.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+full+movie+of+fifty+shades+of+greyPDF 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_off0000b329.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB329	11168 bytes
SHA-256: `20e8401cbd5c9aa8dfa218e0bd6812eb788d2fe0f5e9746c27f17fc91938541d`
`font_01_sfnt_off0000ccef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCEF	15372 bytes
SHA-256: `e3a90fd294ea03a73078d3526a5761f1ca8659a9cff8cecc7ae0a08640cf31c0`
`font_02_sfnt_off0000f3d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3D4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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