Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86f02ad9dca9bb5…

MALICIOUS

PDF

54.7 KB Created: 2021-09-28 03:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4cc041617a368e8caf69b030d03bf82f SHA-1: fafd237818611cf70d035bcff6e11d0ca9e5c91a SHA-256: e86f02ad9dca9bb55a822bc2b876f343e4da03b4992ef99298a6a39c2a4f21b3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the presence of embedded URLs suggests the document is intended to lure users to malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8434

Heuristics 4

  • 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
  • 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://smidgel.ru/uplcv?utm_term=prayers+for+religious+leaders PDF link annotation
    • https://foundationkuzmanov.com/files/vevef.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/vawivadi.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/95297409327.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/57224499563.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/juloxalubo.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210922_120219.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210904/files/20210904010044.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/nirogukuwuxakoniwegodu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146425f72856---15550629579.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/32284297995.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614211e606c64---80244824612.pdfIn PDF document text
    • http://parilka.by/var/upload/file/pusebotifozi.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/lerepuzizetavarebeviru.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/ratiguvugipozon.pdfIn PDF document text
    • http://olympusflights.com/files/files/birofaginubak.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/42165471845.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/770754268614b664eedc02.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/70086008796.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/mawigizetulogimurigasenef.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/badowagokob.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/15042702810.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/rogesozomotakenilik.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/12419082283.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/79138812558.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-25/20210925192449737364.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21A 16524 bytes
SHA-256: 6974595720f1777d6de3cfb0bd81e9e483f147d6de32ae03c1140e60d23a80e7

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