Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7928f144f9d729…

MALICIOUS

PDF

68.2 KB Created: 2021-10-03 12:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fe827d55951ec00d1fcc433f95035ebe SHA-1: ee286c36679a6e65cf94d71b815ed919d2e2681d SHA-256: 5d7928f144f9d729261aaab79ce0eb4b7a369200b33571d3a3759ef32c1c4ae0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://konsultacjenaukowe.eu/Upload/file/kigupefew.pdf In PDF document text
    • http://biancoacolori.it/userfiles/files/88028881951.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/22426874584.pdfIn PDF document text
    • http://stl-hk.net/userfiles/92269775033.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/77143570585.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16153707c4bec4---3290185166.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/retuzigagafilabikepufo.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/pezopuvojamugikuv.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/kegutiwiviz.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/95331578487.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/zifitaxoguvo.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/45550279694.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/gezuwesejekawoxuzesar.pdfIn PDF document text
    • http://stl-hk.net/userfiles/zekib.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/26774925013.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///lopamexavivitifoxuloluku.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/fejiwo.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/37822034737.pdfIn PDF document text
    • http://charontrade.hu/data/file/jetam.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/43271335844.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/45509461744.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/tibulutagegekaziru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=st+george%27s+sixth+formPDF 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_off0000ac97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC97 10560 bytes
SHA-256: 56389818efa1ca8df2dd07ac831b8fcfb5ce9b61e579167063ab292ee4203e43
font_01_sfnt_off0000c4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B3 15444 bytes
SHA-256: c77f6a74d86c3afb01d4d28ac0f471e55c0e0687d3f24ae3b25a284c9c9b5227
font_02_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1