Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36ca20b08cce93d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-13 06:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c023172adb257e3a69abe7cf4ccdff63 SHA-1: 5cd70b347009b49ab21c5ac4e2b542edfdeef587 SHA-256: e36ca20b08cce93d27dc14a2a99f4b4c5a64179cc9b7859ee2b65878e425a0dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF files hosted on various domains suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://speaklifeiamgreatness.com/files/files/zikodivukejidobubo.pdf In PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/likunujutafinaxupoxirurar.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/siwisimanafe.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/tawawemexiberubomezozus.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/gibakonetat.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dea0878f83---witapu.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/fozulatasizawujifasusoju.pdfIn PDF document text
    • http://iknow.pl/files/file/42693162609.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/zozegukaxavufebesewos.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/33015953258.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/saxelosapukinapitib.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/40677641160.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/43706507823.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/72962953150.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/fikaxevo.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/95938536020.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/zomifopamewuweradi.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/losekawizasuwunozafewi.pdfIn PDF document text
    • https://miet.hu/kepek/nufakopagutu.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/pubizupitit.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/65821403452.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec1f952229---zuzodukekevosidawato.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eafc40f5e8---55902395117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dancing+road+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06E 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0000c8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 10336 bytes
SHA-256: 0efc49292fac339b749c84e2a25f3eafd6bd45cb2a160a8770e4a6bc1bd652c5
font_03_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 23716 bytes
SHA-256: 5eec08badb67edb4f72c96af3c5bb4023dfd8486a7e8435922df54a9cb1d7f68
font_04_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 16372 bytes
SHA-256: 3911bccfd68f22c1e71e191850710cb15c0f2f9007ec67f583c1e59508ee36e1