Malicious PDF — malware analysis report

Static analysis result for SHA-256 438e539ad891b557…

MALICIOUS

PDF

70.9 KB Created: 2021-09-14 02:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbb733286b4581f4f8f36b8bd1352247 SHA-1: 38db96ecb2a51a5d5e624fe059ea7ddc32b04926 SHA-256: 438e539ad891b5576cf98fb33a060a3f73401f76af9d7f79c0fed2cdf484ce16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs pointing to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and redirectors, suggesting an attempt to obscure the true destination or distribute malicious content. The presence of many unknown reputation URLs reinforces the suspicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://luisacortesearchitetto.it/userfiles/files/91486994633.pdf In PDF document text
    • https://motoralbini.it/files/file/romewiwufoxujenokeguze.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/46775123699.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/rukogap.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/52161080890.pdfIn PDF document text
    • http://vodova51-53.cz/files/37426702001.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613857fc9d735---kuzineve.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/pulukokopemanipiti.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/vebetixanu.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/ranozuwuwudewotuwuwe.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613940cc27636---fugamujisuxusejeziwo.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/zamenudupi.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/naretip.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/zodotuzepuwakikurezif.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wasudapuwe.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/28663653903.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/mutax.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/48797684793.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/26161990451.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/gederad.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/wededubudolegef.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/bopofebuloti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=perfect+modals+exercises+with+answers+pdfPDF 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_off0000b51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 15528 bytes
SHA-256: 4a6022ed8b6a13890ac586ca31f9de876207fa0eede62da3672696b1ebde994d
font_01_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 11076 bytes
SHA-256: cab9c905a82a2d5910cef135d02e17c694cfc8326793d236f15a4aa533af8f5d

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