Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3995439477ba23…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 02:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b232fef3c0f715103e1ecf60e1903d41 SHA-1: 37e0092ddf445e78bef90a902adb1e7828f82ca8 SHA-256: ea3995439477ba235549537daac89e39da0eac248a6ac2d807ae53fe8c1000f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to what appears to be a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://laskod.hu/userfiles/file/januwa.pdf In PDF document text
    • http://grupopiscis.com/upload/files/58952662358.pdfIn PDF document text
    • http://baoveantam.org/upload/files/28980699885.pdfIn PDF document text
    • https://hgb.se/filer/file/50645518877.pdfIn PDF document text
    • https://csn-alliance.com/data/files/laxilekakix.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/55968814854.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/65308825577.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/vitunegadepasezabufulidur.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/97431115764.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/kaxerezumavexazodejulek.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/33099720908.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ef03e6479---powijogozafew.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/xubekegukow.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/golawiluxunekeki.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/137855541761404e3b41407.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/bojapizojafiw.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/xufuzumal.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/viwazidolipuporit.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/bizeluvuma.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/86710140185.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/17467263015.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/52835771388.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/nafowusidanurat.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/nofanuwujusubinenedamel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=can+android+play+game+pigeonPDF 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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 17876 bytes
SHA-256: 4df52a251534101dd322faffd2bde8c5ad1ded819afd767e8c4155456a19fae3
font_01_sfnt_off0001119c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 10612 bytes
SHA-256: 8added119ca045a9702d29ae701c05f2a4301354ca52d587694069e67229f1ed

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