Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab07a0864d7d5d38…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 17:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa8d14b2ed0ce9e2d68b1bcd0649ba8a SHA-1: 067675d5c713c11f7cc27b4af17489008334be73 SHA-256: ab07a0864d7d5d38bd03fdcf3b9bdd6fe8af1de47cbb8d4a065d8b15b85a9a69
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dongamold.com/fckeditor/upload_files/file/liluw.pdf In PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/87267138454.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/begurowiwekavujatetibu.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/30515946253.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/21266885055.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/zamemenifazivujasukekex.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/35710746416.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pudibujivupupo.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210908_E949A8BE1188668F.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/nufoxiduwaj.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/lixumikezogusexapi.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091206485017.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/69197669869.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/buzobo.pdfIn PDF document text
    • http://autovoda.ru/upload/files/38369657048.pdfIn PDF document text
    • https://hotelcorona.ro/files/gevixepoju.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/kofelepuvelaluserepe.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/77919213501.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/wezofonixofe.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161426b91c437b---62663846092.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/didanox.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/vafixokotepexafixez.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/wotorezozuzexat.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/luxamukunasalufejazuropi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=recyclerview+item+animationPDF 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_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 10536 bytes
SHA-256: 2c4fcf570d0de7cff98a7a70585d4e64f3f88dc69a747ec55a98982308957906
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E25 15988 bytes
SHA-256: c3038965ae5bde20bf9de7faffeb99b3a1a8636176e5e7bfe403fa676a05df87