Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a2e2489013d239…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 10:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 251b729dcf8fc76837180580bfc97b3f SHA-1: 25a3f2e1faa2094ad6aec732dc0a1e444575d70d SHA-256: 33a2e2489013d239fea29699472148f262d0f33a1af7eec7d0849437f0dfc364
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://letdentalab.com/img/files/38617903427.pdf In PDF document text
    • http://avvocato-callegaro.it/public/file/mamelofamepapazutulawav.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/9774151531.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/68865249382.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/37249756546.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/zaxuditigikeporaramixi.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/xowofatevagifazemusunena.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572b996dc3---76179314804.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/lijilividinubabepezome.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/98391045392.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/padomuwatikufitejinu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360065ce21d---94687183887.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/49379274120.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/87376715666.pdfIn PDF document text
    • http://tochuchoinghi.org/files/35179274763.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-06-10-11-43-33.pdfIn PDF document text
    • http://pneusmarene.it/images/file/duponelemofevixumes.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/sewalamatifomugame.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/gozexokobirajigozesujowu.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/33725665023.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/35567770642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+delete+pdf+files+from+android+phonePDF 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_off0000e70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70B 19000 bytes
SHA-256: 05947e7539f0d22f44148b796d4154c106576d97b5a2f76bc4e1c807fb16506a
font_01_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 10840 bytes
SHA-256: 91820bb0346e757a75531f67267770bebe180c9fcdf0cee4bd5aab5c460c7d88
font_02_sfnt_off00013114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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