Malicious PDF — malware analysis report

Static analysis result for SHA-256 af967ef2c0cb7db9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 06:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cb92b9a44ed4b7560b623bc037f6fd96 SHA-1: f0b81438f2d4affeec22eddd41ef110c392e436c SHA-256: af967ef2c0cb7db92accb3e469bf9df039e41881436e8d7c40ad821140ba39a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://livres-d-art.com/ckfinder/userfiles/files/ripokasediremedet.pdf In PDF document text
    • https://yunglin.com/uploadpic/files/papulex.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/17550822879.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/51012229833.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/nubozerenifovowape.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/vowunitozipumubokilovo.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/jaferizovuga.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/7318613537.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/roduxama.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/pepudelinumagij.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/boralobavadakijitafe.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/zepekuvuxexaluzarijowugi.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/9606686545.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/32881591184.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16144afa4e0ba7---59387349043.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/vomobozanekogodugotejawi.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/21734651387.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e333e648b---xiwofojezorokabap.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/sibudujadu.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/45254016014.pdfIn PDF document text
    • https://themalc.org/files/file/94300661782.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/pedoreganokuvupukosu.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/nukulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+san+apk+modPDF 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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 17384 bytes
SHA-256: b0eeaf6df0c34c656d20be455b62b006b484f05e5599975e870f9fdd92aa307a
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 10316 bytes
SHA-256: 120a864ed39bd6a99fea753b05ed105e2689ba9d45e662ab6abe9d8bd681eae2
font_02_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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