Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc85b2627ddbb785…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 07:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a611159e906e704bb913d02ff5cf5c26 SHA-1: 80f3c59105a273aa2483954a9ecfc9d944c59128 SHA-256: fc85b2627ddbb785f98410044cdd1e4995f45a72be0397f55566af3317e321f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with many pointing to suspicious domains, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure and the presence of many external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://studiopiergentili.it/userfiles/files/wadol.pdf
    • https://2acontractor.it/images/file/wajexapufipiru.pdf
    • http://www.lovebliss.tw/UserFiles/files/37676286732.pdf
    • http://eva.am/files/614c81610a4c0406.pdf
    • https://kitapkapla.com/upload/ckfinder/files/rimumowitudiwipow.pdf
    • https://globalathena.com/ckfinder/userfiles/files/58441437295.pdf
    • http://cdkkck.com/uploadfile/file/20210908032254.pdf
    • http://nexxosrealty.com/userfiles/files/kexudusebudizapowotukosej.pdf
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/lekomiwo.pdf
    • http://moscow-vernisage.com/files/files/tijovumuposixe.pdf
    • http://istihdamhaberleri.com/upload/ckfinder/files/39327938961.pdf
    • https://mcsfood.com/images/file/60556532140.pdf
    • http://fittbikese.hu/files/file/54122781378.pdf
    • https://myphambambi.com/webroot/img/files/10052168472.pdf
    • https://media-get.ru/userfiles/files/87601554273.pdf
    • http://www.tokyomagic.jp/images/library/File/17697884342.pdf
    • https://247christianity.org/fckeditor/userfiles/file/nixegaxuv1630768394.pdf
    • http://geodavidepini.it/userfiles/files/divuzek.pdf
    • http://giprozdraw.ru/ckfinder/userfiles/files/bodatub.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/vibobudunetiboxisabuw.pdf
    • http://hflchw.com/upload/file/22365655066.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/71931594715.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=k+means+clustering+definition
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf34.bin
a1bbfa7a368e423423366930e2ba774171f12379fabf016dfd85b26c88e78643		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF34 10912 bytes
font_01_sfnt_off0000e836.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 16792 bytes
font_02_sfnt_off00010048.bin
c03cf0af9be86d7b189f74a61fa752939e71f85fba8a2d636eb3529be37bf876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 19532 bytes

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