Malicious PDF — malware analysis report

Static analysis result for SHA-256 138e0d1786d5625b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-21 00:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e98ba021571d52ebc7ee45b40f82f52f SHA-1: c187d5342721fd64817ce1f69947b76011c9e461 SHA-256: 138e0d1786d5625bcfa2e1e12de3f3079cb315d58a7d22d975a4b7a0e18f4eba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics identified the document as a link farm with numerous disposable hosts, suggesting a phishing or malware distribution attempt. The embedded URLs point to various external PDF files, reinforcing the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://colafranceschi.it/userfiles/files/55321196334.pdf In PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/66866815744.pdfIn PDF document text
    • http://getem.pl/files/file/nurotuwuru.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/5129342535.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/29093095020.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/kivefivurikagupop.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/relemazawomup.pdfIn PDF document text
    • https://pr-dienst.ch/file/3508487930.pdfIn PDF document text
    • https://aitalk.vn/upload/files/juwew.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/muribelobiju.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/97856468995.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/93618388367.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/sisoxodisobak.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jidezuroluk.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/17550035387.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147b50cd7c5a---29049758112.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/34579633409.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/95592922507.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613792dbd6769---65643700164.pdfIn PDF document text
    • https://5udua.com/contents/files/lugifojijaduluf.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/80892364325.pdfIn PDF document text
    • https://atrax.hr/files/pidapuxogisodedelu.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/20440326831.pdfIn PDF document text
    • http://sbairs.com/datas/files/28195877374.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/zigotiloloxasimojida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=storming+heaven+pdfPDF 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_off0000ca09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 17056 bytes
SHA-256: 1ff86344eee11c64d541b7df37cae8432a15033a63474fb9755f157a60042ee7
font_02_sfnt_off00010e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E27 10872 bytes
SHA-256: 46e281e40fe381660bb0aefc8a1e836b1b9eeed59c0c89886c98339d6a4a1882

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