Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be5cb893a702bd0…

MALICIOUS

PDF

98.8 KB Created: 2021-10-11 05:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8050fda9d1288f1741818b73d0c8276d SHA-1: d4957fb9dcc24023a6bf07077f7566d9b7da130a SHA-256: 5be5cb893a702bd0c35562c5ad4d54d8db1f6fb94dcdf8a3051f5ce34e7c0d02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ytdrive.com/CKEdit/upload/files/nadedigevoromoka.pdf In PDF document text
    • http://ajtoablakcentrum.com/_user/file/vakinu.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/pigaxonugir.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210925034639_gxzkwm.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/sawuzezukiwaduwo.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/74763726074.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/jexekudo.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/93395472179.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bbff2e94d---35380350921.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210913_220228.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/64329129291.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/nededujajog.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/tefakifigovaluvenino.pdfIn PDF document text
    • http://adanamega.com/userfiles/file/46199686234.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/85578760101.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210929202418.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/98732194608.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/zumejemifegitutazemovo.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/geravile.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/vozirupiziza.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/xapofigoso.pdfIn PDF document text
    • http://koutingchina.com/upload/files/8060059473.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/kovelowiratirafomup.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/dudenaxazemuwununitur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+three+attributes+of+godPDF 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_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 10688 bytes
SHA-256: 438b44bc67dac3989cb929f11737c7d13845f47a3e17967c0cba3bcfc6d1bce8
font_01_sfnt_off000130f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F4 20768 bytes
SHA-256: 3c43e3dd8f923d57ce892a49483999524d84c41ff59f9c57adffabff55f483ab
font_02_sfnt_off000165d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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