Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39bcb783444b72b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 21:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d1a4109875b99a160558d78665ded2b SHA-1: 49c2b36961625b874b167abcc554cfdf5ba1ac53 SHA-256: d39bcb783444b72bd5d003f641eaeb797de63f75d924d5cd2b93bdba8e2d1381
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to potentially malicious domains, and one URL is identified as a link farm. The PDF structure and embedded content suggest an attempt to redirect the user to external sites, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://daugiavanthienphuoc.com/media/ftp/file/xusujusuv.pdf In PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/nivonukukenef.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/wibidofigepud.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/wibefulitufo.pdfIn PDF document text
    • https://webrobogo.hu/kepek/lefelaputetazip.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/pinibepemo.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/23047072845.pdfIn PDF document text
    • https://rajakedua.com/contents/files/kexojoxojetudi.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/zulirapivivajesanukuji.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210911_08D2DA5E3B407E7D.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/sawaxofoxuwidon.pdfIn PDF document text
    • http://jfe.hk/userfiles/mudafaxurivabizijovawev.pdfIn PDF document text
    • http://dkind.net/userData/board/file/35817915326.pdfIn PDF document text
    • http://jljemc.com/upload/files/64698271847.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/85238093325.pdfIn PDF document text
    • https://palet-school.com/files/files/19289120678.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/81425867305.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/13223722600.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/bovafam.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/xikatofekuxezuletoketiloj.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/remimipeson.pdfIn PDF document text
    • http://szhlfz.net/upload/24962732189.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/potomedolo.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/62684009348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=telecharger+viber+pour+androidPDF 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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 18556 bytes
SHA-256: d0b8815e3b953a374e5ace46e59c4af5999fe126e892c4851815345e77ba0f2b
font_02_sfnt_off00012334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 10796 bytes
SHA-256: 3caa416087da03c91825886fe6f137ff86ba3a3a51e69785837a79477d28913d

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