Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a355df1d9200cd4…

MALICIOUS

PDF

85.4 KB Created: 2021-10-07 14:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e0aca37335332e867c00b941bcb61c09 SHA-1: 12c672235f53ed088ce41cae408d7ae17f231240 SHA-256: 6a355df1d9200cd447f0956ac0513b2440e0d600d9d5cf99af940cf47be7a296
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to suspicious PDF files hosted on various domains, suggesting a link farm designed to obscure the true malicious destination. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/00d6957b97dbecba42dd9383ddee9756/64020107644.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pubnpegu7p13orb2rd81pue8uh/xujeladawapuxarawivupu.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/6494807359.pdfIn PDF document text
    • https://kudusde.org/resimler/files/noposedevaf.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/takafefasawisodenigi.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/38479889070.pdfIn PDF document text
    • http://askort.pl/Upload/file/xelixuwofuwepesafepofok.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/vudopamavowatitod.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/45817561893.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/bixeniwulog.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/debev.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/bekenadelutido.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109181313507360.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/21602283217.pdfIn PDF document text
    • https://clubselect.ro/ckfinder/userfiles/files/83146889845.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/rejineburep.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/tibitafotibekowa.pdfIn PDF document text
    • https://mklaassen.nl/images/file/biriki.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/82990083158.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/wodulajik.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/57751691189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lucky+time+slots+free+coinsPDF 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_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 22692 bytes
SHA-256: b90bb5ad96a888b9355a95cdef8fbf04fada6fcb822ac278b7fb893032d38e80
font_01_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC3 10596 bytes
SHA-256: cd51e5d7c333fd2b01ab80cbc9ba8e1f7c3a8b98058978a9f81c8f5261721496