Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e39b0b08bb72f81…

MALICIOUS

PDF

82.5 KB Created: 2021-10-05 18:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0041d89425c98bb2237aceaf8ef2a682 SHA-1: 8777aab74ec29f1d540b4bdffcf964ea8e4d1172 SHA-256: 1e39b0b08bb72f819b8aec22d6f4d1862cf39bec7c8b752e476cd2f90fe632c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, content.

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 http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3d00ff47---6375952511.pdf In PDF document text
    • http://excitechem.com/userfiles/file/gutexapakezawojutalifad.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/segezapebulel.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/45221972662.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/97715358870.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/xopomejurekiforolotogiwu.pdfIn PDF document text
    • https://truongdongkinh.phapluatvietnam.com/upload/ckupload/files/sipejunodumugajo.pdfIn PDF document text
    • http://liily.jp/upload/file/20210902052644.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1615b78be59432---219014989.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/piviwugajapev.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/dapaseda.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/7394809357.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210922142916.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/88054566073.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/92855685961.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/zeragupagesejadefaduvo.pdfIn PDF document text
    • https://fasaac.org/temp/files/zomilinobepomalalun.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192194868826.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/44848374513.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/lunafagulotij.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/53141939275.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/90480507466.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/mazepetejubukobowatolufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bsc+1st+year+chemistry+practical+book+pdf+downloadPDF 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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 19448 bytes
SHA-256: 4a4d982961aa64d74949b1d9a390f918ffdc5a278988bcedeca635c3185b2bdf
font_01_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 11420 bytes
SHA-256: a2a0c875e4c02366016d2125f9e7392ef46e5ea754c934269992d3fe5afad79a
font_02_sfnt_off00012387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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