Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf4c7d310fd2dbf…

MALICIOUS

PDF

85.3 KB Created: 2021-09-22 12:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 479cea68394d47a014abce6569e389bb SHA-1: e4336e5d3e4e229bd43753f9e7352bea26458d71 SHA-256: ebf4c7d310fd2dbfadb3d3585ee64e35a738eafddd2209ea0fbe8c5a59ac5b33
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://performanshost.com/calisma2/files/uploads/xisalalurivarosapipez.pdf In PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/puvewurowikosisojed.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/21358527871.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/voxoze.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/rirujudokupibimavopofip.pdfIn PDF document text
    • http://dgjst.com/upfile/file/milaniraweje.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210913_974FDF0DCDAAF895.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/katerikibu.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/66702439716.pdfIn PDF document text
    • https://topupdana.com/contents/files/tukolebupinewiwulir.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/gusefijepagapu.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/fotawemaxezi.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/35983182408.pdfIn PDF document text
    • http://bienbao.org/uploads/files/razumu.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/97088958649.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/36595436367.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/53246803171.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/kitufevebezulonewixigovin.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/sanivivonod.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/tajez.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/kusuboxi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/82u8uea6u2e0rrpbpkbtdl28n5/kokatuxigarivuzaxuxasari.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/kamipugovininelevo.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/8842688981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=clone+android+screen+to+pcPDF 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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 10536 bytes
SHA-256: 041a970a1bd705839416f93734335c9c6aafe4935723ad9c38d1f57f0b0d5398
font_02_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 18808 bytes
SHA-256: 53a5f7a45b60fb19299fd750777ff6a25209c23faff473854c03b5ab2d0fa579

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