Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3562c8b3ce23971…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 15:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8939afa833ce22bf76813ec7082d0e3e SHA-1: ff91911298d6b46aaf7778945b2f46fdf99112a7 SHA-256: a3562c8b3ce23971db6ce9685ecc42b5de276c774aebc24f4c08606ea6bd9fbc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, many pointing to potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/15823288302.pdf In PDF document text
    • http://nriloan.jctoursandtravels.in/files/pokujikapijozasijunu.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/waniradosobasumegebubi.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/nelirulebizivomog.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf2a28ddb---78567572812.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109081421057144.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091210190995.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/wekikezerot.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/11207392365.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/nafazufa.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/70292213129.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/turasatori.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/68521883528.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/ginokiwibatorafu.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/sotufalujirisaniredimusoj.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/nibulaxeravatokovojizenex.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/vutufuwedozevakonek.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7f92e9e2eb10c2c01ee7ea27a76792f3/kebadezedipojubiwita.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/37909742016.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/96417146915.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109011102337202.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210902200721.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///saposavaselewob.pdfIn PDF document text
    • https://solturism.ro/images/file/xikatemenanudokusag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=droid+drive+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10128 bytes
SHA-256: 4884ae9ece8be1357fa04ded0078e17cfcaf06ec4b4353dbc97afe63046169f5
font_02_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 18064 bytes
SHA-256: fb5f0e52193263dc91eaa7f8528b624cde87686cf088228d243a077ba7eab6ef