Malicious PDF — malware analysis report

Static analysis result for SHA-256 da566c25b599f73e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 15:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d348ae97c435f57c734071ed77dece39 SHA-1: 4cdb74f6c4c1b087cf4756eb36fbb6f1863a378c SHA-256: da566c25b599f73e5aba62340148badd4ea20fba9599fb0e5a639105427c4544
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://iqlacpro.vn/emotive/upload/files/47751143717.pdf In PDF document text
    • https://minjar.mebel18.com/uploads/files/seriv.pdfIn PDF document text
    • http://robedecreateur.com/img/files/71798116344.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54272662167.pdfIn PDF document text
    • https://gdaniec.com/upload/files/69184876312.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007d4c0284---pojegewanirufe.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/41305644522.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/73885218254.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/sovamufudi.pdfIn PDF document text
    • http://apismorava.eu/docs/rejovepizitajodizugo.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/19326902332.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/ruzawabixelavijuze.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/070321284996.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/61065051016.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/mokewuwaligilidisu.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/wifugululudopedi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eaec7993a---86690850460.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/xewusidefenimaxi.pdfIn PDF document text
    • https://cmoretv.com/userfiles/wigonemagotizi.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/devarelomakowu.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/51145585230.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/81842485577.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/verupud.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109020418522469.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/vonuregomewuzugowezegis.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sename.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040311438581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+gta+4+ppssppPDF 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_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 10408 bytes
SHA-256: fc9aa4041b158f643f9e033254b9299d6f6dd4770f1f2de1583791fb6543e6e5
font_02_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 18176 bytes
SHA-256: 71c9a7504f428a3f0c64c8441e427dc4ca8349957e98c2a853a8f6eee5ec25ac

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