Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5ea01c70bb80d8…

MALICIOUS

PDF

102.2 KB Created: 2021-10-07 20:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 066b86aae2ad2eb71296a3663d31f2c9 SHA-1: 8cf9d53afa062e5629543c870771f576bbc85928 SHA-256: ef5ea01c70bb80d84fb5e0a691f7ec2c13492858e90f3a1289c1bac63dd1aef9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to host a large number of links for SEO manipulation or malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d7e4dc8772802c79bf87e27f2dfc4e18/30111202905.pdf In PDF document text
    • https://kaktutzhit.by/uploads/files/4577003926.pdfIn PDF document text
    • http://hzqzg.com/d/files/48626597320.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/feruvakafejapalizex.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/vajukarataruzerafifa.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/tubetofibulekis.pdfIn PDF document text
    • https://zzhqhi.com/d/files/98220882023.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/51262570778.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/81274593846.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/kaluboveveropikubiwep.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/80026829677.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/zoguke.pdfIn PDF document text
    • http://canvangdientu.com/images/file/57461340784.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/vuxejalepusiwusedigibojuv.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/bigepozumagamevagil.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/rivudojekijomukeri.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/suvifolofuv.pdfIn PDF document text
    • http://grabnerestriche.at/58930439114.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/54409800524.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/2065688046.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/sirokufa.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/vemikidejikuvelilekapa.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904233321366.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/73262688964.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7f6d00763d4c97e137763c4ae0c32347/88835594922.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/fesofotoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=is+benzoic+acid+soluble+in+etherPDF 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_off0001223a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 21852 bytes
SHA-256: ab776d6c354ceb0aa5a105ec394351604255362b2d6f3280960c5028791ab5d0
font_02_sfnt_off00017225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17225 10720 bytes
SHA-256: 19a821179d36198df3348d00dcd21ddf6ffa94449e6a439b4fed1e9bfc4f8e3f