Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96b99b353989cf3…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 14:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6570b932898c5ecd26569e527827363a SHA-1: 1f063f04f2d12d221e27df1cea147d68014d338f SHA-256: b96b99b353989cf300face27d6007274507ef3726fcd2ffd3cfc4b606fa368b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs and is identified as a link farm, suggesting a phishing or SEO abuse campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ramenhajimetustin.com/uploads/files/titemoxurulawipu.pdf In PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/fudikagew.pdfIn PDF document text
    • http://texmet.pl/userimages/file/dujovitefusufikuxiwubedu.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/wubunumi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3cf051ba---13794082632.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/29154637674.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210925_174514.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/zavogevixurapikanesutu.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/xarimonijoladiri.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/gupulukorakosodolelem.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/73582076432.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/21994552725.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/rejojuge.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/95455684983.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/55652089123.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2cee00ab---kutavavulisu.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/mabajejaze.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/satijosus.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/2792836003.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/80504075565.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/xomulukavezalepifazur.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/jibubivuzado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=most+downloaded+camera+appPDF 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_off0000b270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 10664 bytes
SHA-256: 3d294b123106d04e5c3ba4e87b61f3537040591e32cad1af3aafe6984cfa073d
font_02_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 17268 bytes
SHA-256: 570e4ba6320172bb39edd96a44179bec0cb2d854d08e07abe4121a65a1ff3b26

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