Malicious PDF — malware analysis report

Static analysis result for SHA-256 966e6c070a1feb94…

MALICIOUS

PDF

71.1 KB Created: 2021-09-21 05:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aaa83d881fdd397b533f3b8567078b8b SHA-1: be927c6bc67fb0e29f25e834b4cec47f0e904c07 SHA-256: 966e6c070a1feb946cc9c637c089a395ba4c62e5202e955efca18b62ea043f0c
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a link farm detection and a high ML score. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a distribution or phishing campaign. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://angerdress.store/ckfinder/userfiles/files/4339284952.pdf In PDF document text
    • http://tuzvedo.hu/elemek/file/sifiwazudugitasuvax.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/37687242534.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/walelitijapijazila.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/vuvarimuduwiwigokeba.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/aa0d97bcd56bc843cb241866863f9394/23938042799.pdfIn PDF document text
    • http://spharma.ua/files/file/6874786094.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/ganuvulozoramujezegizulu.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/fesenufubapasimodinuf.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/60455495920.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/kuxezajopabuvudidopuvi.pdfIn PDF document text
    • https://fong-cai.com/upload/files/lopoguranapep.pdfIn PDF document text
    • https://mavibusiness.it/file/67405527018.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/49644387368.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/kixokajobisoxezazowomil.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/41523214583.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/15773872760.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/18980943305.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/88906350752.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/298854897.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f960abb06---48434563796.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/kotasebusajarelugo.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/bosiwexujugabubuluxusakoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=whole+lotta+sabbathPDF 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_off0000b5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F5 10040 bytes
SHA-256: bcfb1434bc4ff7ab14fea95dc0e3f711b2885df9567bb24d0cbb5486f6789483
font_01_sfnt_off0000cc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7F 16492 bytes
SHA-256: c06e5d9e85024fc9ec3768ec68080847d80ad775c71aeb4333a8d0d986aa6806
font_02_sfnt_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1