Malicious PDF — malware analysis report

Static analysis result for SHA-256 463eebdce99bfc67…

MALICIOUS

PDF

118.0 KB Created: 2021-09-18 06:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df01413e8caa31753fdcda9c4831769f SHA-1: b8c18008491adc5849617298a15e1d24d3b90106 SHA-256: 463eebdce99bfc67e974df6fd9d5d136dbba4cf2c5317b4add6dc1de25a431c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://siam-royal-view.ru/data/files/gadorajofujogisak.pdf In PDF document text
    • http://nfc-lampang.com/user_img/files/nejirupo.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/fepaxosezodifomobe.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/zasasazejutos.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/6920408582.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/pewak.pdfIn PDF document text
    • http://carszana.com/image/upload/File/37351104268.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/nileligasurivotixexebe.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/44669745969.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/18799717024.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/pedidozuvaw.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/rufixalanekez.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210909093453711298.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7450bd35---molax.pdfIn PDF document text
    • http://asustainable.com/global/file/zimigowim.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/27395659378.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/67069507041.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/beroganonopozexakofobogup.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/12933665546.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/veduzozav.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/sidobilexuva.pdfIn PDF document text
    • http://lovesenergy.nl/file/nifoduvugibiloze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+flutter+in+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_off0001661b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1661B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E32 10544 bytes
SHA-256: 47a129f5bcd6d2855a8b99db252a10bddf11244477f86b21619c352965eaa804
font_02_sfnt_off0001962d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1962D 19612 bytes
SHA-256: 7cdf4d3bfd4f075e39301a834de293d6bd8d648295fd17a2966941b10ed83438

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