Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8cebeaddda54f3…

MALICIOUS

PDF

87.0 KB Created: 2021-09-20 03:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4dc9a9b7df11abc9bc91dc6495ea4ccd SHA-1: 38af423743a5085ebf825ed9f5027c4997f528ae SHA-256: ca8cebeaddda54f365d7cadf7b8335683f661502c3c3b82784f4fdb0ed858018
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://archism.ru/uplcv?utm_term=logan+paul+vs+mayweather+scores PDF link annotation
    • http://odontoflash.eu/userfiles/files/11565630208.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/genowokujivorigunala.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/fudawiraleworavugabi.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/xujudamulaz.pdfIn PDF document text
    • http://rs-entp.com/upload/file/34278272719.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/tanepufuvenajigiluz.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/sulawetufometatedaj.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/389986646.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/73825280862.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/82935688173.pdfIn PDF document text
    • http://trubaopt.ru/content/file/bujejewubig.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/90011042361.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145774250c70---gesonojusivututirolavox.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/gepulewupodupoja.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/73304754637.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/xipejogak.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-17/20210917223142764164.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/85497364453.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/87589437897.pdfIn PDF document text
    • http://regmac.net/userfiles/files/61686102357.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/pexuxononad.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/gupebib.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/kawapafisofuzinidexikipog.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/77382347564.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/3751217771.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/8668325097.pdfIn PDF document text
    • 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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 18308 bytes
SHA-256: 2f07a552fa02928d5ef8061a9d8c70292fa47ae72582c07f3f96353abb2a5a9f
font_02_sfnt_off000134d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 11052 bytes
SHA-256: c12dbc0b6fa6fa4da8ced3ebe2e73c309dcd963136f72b2d15b8c9c61f2fe56a

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