Malicious PDF — malware analysis report

Static analysis result for SHA-256 254de48fbdbb349a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-15 20:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96d3dc99cfc075de71b2b87e19512907 SHA-1: 069dc6fb1a6163d8f67aabe5ecfeb625345111f1 SHA-256: 254de48fbdbb349a1ba1f1d900a6ec4c272e9020e59343b44ff38eb67083892f
126 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. The presence of numerous external URLs, including one that appears to be a link farm, suggests an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://casms.org/atts/news-files/file/savowaxefetigusalorijizit.pdf
    • https://adesso-moosburg.de/images/file/devilirizosugijejevinuri.pdf
    • http://dichvugiayphep.biz/upload/ck/files/24212055569.pdf
    • http://haitrungkim.vn/uploads/userfiles/file/91076244481.pdf
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/16882209316.pdf
    • http://dhleisure.com/ckupload/files/talubafojadizelobunixi.pdf
    • http://aihyang.com/userfiles/file/dunuku.pdf
    • http://trungnguyenjsc.vn/uploads/image/files/48808344175.pdf
    • https://darshanam.com/ckfinder/userfiles/files/92658509349.pdf
    • http://dejede.com/userfiles/file/59952459741.pdf
    • http://phdpecs.hu/userfiles/files/65249164255.pdf
    • http://renknh.com/ckupload/files/zusavukefugosavixikufobov.pdf
    • https://cjsc.se/ckfinder/userfiles/files/gunogawowukakikofujoret.pdf
    • https://pingthye.com/userfiles/files/81108805219.pdf
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/27083979480.pdf
    • http://mediacast.vn/ckeditor/upload/files/43105110556.pdf
    • https://fabriziochessa.it/userfiles/file/fenovovoj.pdf
    • http://tangneylaw.com/admin/images/file/puvakazebiniduporumafu.pdf
    • http://casaperugia.fr/userfiles/file/pufesalavomujapiwikivoman.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deca7f2219---xiwiveze.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82fd5d653---fosavasufuxulumon.pdf
    • https://www.corpeverest.com/ckfinder/userfiles/files/jituwiko.pdf
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/27754024609.pdf
    • https://dogathermalhotel.com/resimler/files/3488552079.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bully+full+game+download+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0af.bin
add104d25bf4f3281bfc957726d3ce12435016a3d490cc132d2fa0761b4de219		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AF 10784 bytes
font_01_sfnt_off0000c952.bin
17c07b387a5d8b8ca2b54ef872ae58b0f2eec9e8132200add80c93aeed62e691		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 16820 bytes
font_02_sfnt_off0000f43f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 16792 bytes

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