Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90674451af021ea…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 08:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 340f208eeeb9c8d47d4fcc439462f2e9 SHA-1: 9dcc263a13dbe531a46a6845d650801e298e179d SHA-256: d90674451af021ea9cbb7b78b6a38cf662810e1cd00eae00cc37699b2b38305c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yoshitomo-kokubunji.com/jcfiles/file/20994784868.pdf In PDF document text
    • https://eastoncn.housemember.com/uploads/files/zazafubunokikogetulazap.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f350ee25f7---ritolepisolibidodeda.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/64385817115.pdfIn PDF document text
    • http://go-forum.cn/upload/files/ruvuboxasorenonadojatufab.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/50793226548.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/72881586645.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/mopapusozuvo.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/85135495564.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/xegexul.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/35750054486.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/51059969477.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/37030757309.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/zodevitadupefiti.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/gonus.pdfIn PDF document text
    • http://napiarsaigh.com/images/voralin.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/memukipumifiratimurumikij.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/suwozipopepojovok.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/80289448903.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/gitaxeramikalika.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/funet.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/79500856968.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/6584783384.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0239fbd7---48650487035.pdfIn PDF document text
    • http://15881588.com/ckupload/files/51869624319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=el+arte+de+la+persuasi%C3%B3n+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_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 19412 bytes
SHA-256: e30a536f3312e96ef5f5633c9f510ef7f6f1f2496c9d53f2658580063b138a36
font_02_sfnt_off00012c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 10592 bytes
SHA-256: 4925910692dd09c94633def2569a59b187b93034d46860355ca5059114f4eb4c

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