Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1519e4e2ac3cc1…

MALICIOUS

PDF

88.6 KB Created: 2021-09-19 00:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e3d40cc1a7a1c807a8dddf93e97f68fb SHA-1: 16e970499f6dcace2f7f2d3aa11385d5f18da8ac SHA-256: 2b1519e4e2ac3cc1adb70c2fce0d80ea6b4ee5579d5bbd1c21bf7cb15bc35209
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to obscure the final destination and potentially distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://wastran.ru/uplcv?utm_term=how+to+copy+and+paste+sms+on+android PDF link annotation
    • https://wroclaw-effatha.pl/grafiki/file/83433268015.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/mafedogaten.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/42313679836.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/vetuzobutolofinix.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/fuviwajozagabe.pdfIn PDF document text
    • https://everestart.com/images/stories/file/wudole.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/numeseguzusiwijakunem.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/sekarevizupik.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/dagoruwasizig.pdfIn PDF document text
    • http://eksternest.be/images/file/vujejina.pdfIn PDF document text
    • https://basisnomor.com/contents/files/zatapolidatifexoso.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/69276349771.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/57773622335.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/domilimoriguxonipakajenom.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613967c122a95---wukixefetupuzetos.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/jatapalakibekifox.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86189312697.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/vigasewuxoboxegudo.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16133d592e8cc0---60236904196.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090212061073499.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444d1c95af1---90003304154.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fokavokig.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/kazapolesavo.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/buzobevari.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/wusiduwebolifovan.pdfIn PDF document text
    • http://iscelenie.info/files/file/46257292805.pdfIn PDF document text
    • 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_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 17676 bytes
SHA-256: f6a008e50da1a5e52875194820063c28ce4dbcde130a4697a2bc586a6ce690de
font_02_sfnt_off00013b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B26 10820 bytes
SHA-256: 45368322254e3cf4f7cea0523cd132a82739d0ae65da71fb471d44b8e4124a72