Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c349b47fb5671d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 05:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74c1b27198be8159e8e0f6fb30004fa8 SHA-1: 47e45b1f3fcc07e2d714cbd9839ce6d26819935d SHA-256: b3c349b47fb5671d06efc4be1af88524880d5682d11f73d11efb8b517eeebcae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the suspicious nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://relaxbotanika.cz/ckfinder/userfiles/files/lonimopuzezijili.pdf In PDF document text
    • http://flomojapan.com/upload/files/jujodusiwezaletav.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/sitoderuderobiladizo.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/pasopoxusa.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/88883392023.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/66293158362.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/80828002877.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/tivelebojiweludurab.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/33724218057.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/xokodolejaxasimogipazi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16134a513db043---dikunozokurid.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/bogutaxetelejuluvaf.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210917_030321.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/dqeh06gn05qns92jfijmcjjvj4/fajel.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/desep.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/22044742513.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/5792544134.pdfIn PDF document text
    • http://arsvet.ru/img/upload/dixozepalajo.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/tizopawat.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/bisodowoxavatonujuz.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/21421676821.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/wekerurokodivil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=endgame+movie+onlinePDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 17112 bytes
SHA-256: 8ebb57fefc68e0badabef98b1acfad2465e4018ae429a3454bc54461224d4e10
font_01_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 10272 bytes
SHA-256: e0dd90c7942e00022a679274d3b46a18dabc8d3e82cabc54dec61c4b9d6be927

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