Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b31694f12054603…

MALICIOUS

PDF

83.6 KB Created: 2021-10-15 11:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9346a5416c495475af30e989421771f5 SHA-1: 62fe36e33f08bd19790dc2b885fcc924045c1a66 SHA-256: 1b31694f120546038a09baddd50fef4c6bf1aa23f26802a8cb0ad1f5382c8b67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with a significant number pointing to disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links are commonly used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://grancom.by/upload/docs/32630968999.pdf In PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/tonatijusew.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210902_123411.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///73381054990.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615959967faeb---69220122602.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/59952686424.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/gawodikavitawej.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/63572160301.pdfIn PDF document text
    • http://mariellatriolo.it/public/file/6410447122.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/pawatewubilosivunesolon.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/kabojav.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/xotupexuvefubugevof.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/tanewulemu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1616705b45ef94---nanijenidanozenofavanoti.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/jujuzig.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/85398012136.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/6659907483.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/riwoxum.pdfIn PDF document text
    • http://446888.top/userfiles/file/86187139297.pdfIn PDF document text
    • https://luminex.pl/upload/file/sakuxirizutoradazozanena.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/niwinafibosamevoxi.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/63387306598.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/muzuvilulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=exist+in+tagalogPDF 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_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 19496 bytes
SHA-256: 5a28f0fd1b6ac5b5831cdb624ee51d0d8c4d6e368a3e168749d74303a3601dc0
font_02_sfnt_off00012a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2E 10136 bytes
SHA-256: a7500e6121a441b9f064a2a33eaecaf1efb57653dc67ad82db59dd67af9644ce