Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79f1547adc59c6b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 22:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df8a5997e162c97d77d4d48c4b745a08 SHA-1: 5b4801f0798e5451a00b4031e2f2732015db19c9 SHA-256: b79f1547adc59c6bd4f1a04643385189396dcb685006a5a74f4a0a6cd02c8385
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms that the document functions as a link farm on disposable hosting, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://inwebjor.ru/uplcv?utm_term=spiderman+ppsspp+game PDF link annotation
    • http://qianxi.cn/filespath/files/20210903102846.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/joluwaki.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/10329111352.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631056302.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/67613271343.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/dezogewepomozajebol.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fubezidutopar.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/xoxurixebiwibeju.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/80805909959.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/sejuvulanewubifojorumosi.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/vazenofuwupuludejexuku.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/liwaj.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///3118004574.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/nilewokugenu.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/renuv.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136639e7791a---xakoviwitojozipamivip.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/lenojibikenunigo.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109041359141133.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/58046294640.pdfIn PDF document text
    • http://favourtec.com/attachment/file/78925702745.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/xiluwipubogepawikopep.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/muxejazotupatunix.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/lanixarurimorituvan.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/kasamonedow.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/74334178207.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/70472211893.pdfIn PDF document text
    • https://petala.gr/userfiles/file/tesugaragelesi.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.

FilenameKindSourceSize
font_00_sfnt_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 10544 bytes
SHA-256: 8660e929eefb5b02f308107255eb94acc4cf71ae18aff8cb02db1be314f5850a
font_02_sfnt_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 18424 bytes
SHA-256: 6f0f320977d700640c739de459788dfb9f9610bd4db64f6b7ff9e4e6b5c490d7