Malicious PDF — malware analysis report

Static analysis result for SHA-256 d143651de6b0b369…

MALICIOUS

PDF

77.5 KB Created: 2021-09-10 06:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a15200b3ac3cf5eb00aa4fefe2851441 SHA-1: bc5506e965018336afc78690ab4715644f20cc05 SHA-256: d143651de6b0b369893d8e2d5856793b6e58daf84301b6f7988de0ca12bb25c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to a link farm structure designed to inflate search engine rankings. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's part of a campaign to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://asvpp.fr/pdf/renisedujefabotewokona.pdf In PDF document text
    • http://atol-res.pl/uploads/file/dasikunepadu.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/50272458288.pdfIn PDF document text
    • http://ping-property.com/user_img/files/20061983064.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/rowovoleluzatiforo.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/88872362898.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/pigaweboku.pdfIn PDF document text
    • http://nemochem.cn/upload/files/18193143422.pdfIn PDF document text
    • http://dsraxys.com/uploads/fusalimadefiralo.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/67779262450.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/pameruzuzogef.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/12581635155.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/10840005277.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/48877749442.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/nebegagatakugujo.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090915093177.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/vopogepikusowol.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/21690253595.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/77283624061.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161339940f2442---98898194807.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/kejurufadutozo.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/22469299683.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/88093305679.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/79749144720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=galaxy+music+apkPDF 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_off0000c9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D2 10428 bytes
SHA-256: cdc3b0fe7bb005b094def855e64ff6940544a1b1699aefeafae97e78588e39ae
font_01_sfnt_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 18116 bytes
SHA-256: 508f220be9ea4337fbb87911d6e542fb0f97c1aa4ff652401fd1f85683835bbc

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