Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea7c7f7100fa953…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 16:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42133a47e3ce587915637e11e98fcf44 SHA-1: 2818bae1b3573f731d4841e35a076c5dcb18f5d8 SHA-256: 5ea7c7f7100fa953f85f4715f42aedc33b083e18e9348cd8c3036d2de4a1014a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, such as http://eskuvoiiranytu.hu/blog/file/memokevusabuwus.pdf, point to a collection of disposable domains, suggesting an attempt to distribute or redirect to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://eskuvoiiranytu.hu/blog/file/memokevusabuwus.pdf In PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612edded17509---guxezudomajiri.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/83593009220.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/40598025240.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dasekavatipozejonel.pdfIn PDF document text
    • http://parentini.it/userfiles/files/22610499581.pdfIn PDF document text
    • http://elsped.hu/files/file/wabulukunijezutujo.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/36191980876.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/jimot.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/gitunixojemitifakiraramag.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vixijilomanixobugarijej.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-17/20210917021740560442.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/9731463087.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/dobelitujomu.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/nutazoginofufevose.pdfIn PDF document text
    • http://intertribo.sk/files/bufisivezukozironawotozuj.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613851bab51e8---rutabubumobujetizukesakax.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/pajaxaxafidazadu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fotugase.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/26827530792.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/47553265631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+phone+without+pre+installed+appsPDF 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_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 18704 bytes
SHA-256: 1af5ffa623b476ac61f09f802a973bcf9f614da0c2cd474cf56dc828e1167933
font_02_sfnt_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 10656 bytes
SHA-256: 8d9e3a0ed6709d6d713c78782d1570685cdba47129f9ac6beae8e11b53c051aa

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