Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5cfdb2c2c974b2…

MALICIOUS

PDF

88.2 KB Created: 2021-09-13 11:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 646e3931d48fbb7410333fa5c1c37a66 SHA-1: 54107753991ad42aff7e8e8e8aeb1cfaa04d7ce2 SHA-256: cc5cfdb2c2c974b2541f1e17e6dc707061820cd7ad0289eade1a8f6bac92dfe8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs point to PDFs hosted on various domains, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nowator-zpu.pl/userfiles/file/wudotusuwakekifome.pdf In PDF document text
    • http://lakesnwoodskerala.com/uploads/file/refoludoparonuvumusefim.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/70033720998.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/23417764867.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109021830306007.pdfIn PDF document text
    • https://auto826.com/uploads/files/50473548438.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/xamisukiwukifamobudoraded.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/11992038983.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c151bd6f95---bibup.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612faaebe39a7---24699908216.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/sejevozewodebukejavi.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/11897254935.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/44750097999.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/zewujuborupav.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/21072867165.pdfIn PDF document text
    • http://yoron.net/up/files/14190563935.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/12263892482.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/97173363112.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/82295112186.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/97471691185.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/xaxoru.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/lividekotap.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/64638760654.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/wilotapureper.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=idm+patch+2021PDF 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_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 17928 bytes
SHA-256: bbe99d6d13f8d43461cb53f916ba0ab434322dca47a55de0e5808d9136e54463
font_01_sfnt_off000123ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 10260 bytes
SHA-256: 3e34822052d188f9b192cd2f03ffce83c752496fa940d2ae19d24c8955521d8c
font_02_sfnt_off00013b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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