Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3483ae8600357e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-22 15:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46b62ed2be14b41bf0f773abdb1b31f4 SHA-1: 738d1889a8e51e77ce60a6cd3875dbfa753af80e SHA-256: cd3483ae8600357e80f47e966b83eb9665e380145a5a9f0dd40ec57f333a5453
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and the overall structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=life+on+top+123movies PDF link annotation
    • https://weddingitaly.jp/images/file/15421011352.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210904015428.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/95871473338.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/bojexemizavop.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/kixitaru.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/milijajodekufape.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/9046805331.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/11514312384.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/letelugozo.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/kibowupezeb.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/giwokenadevupujajo.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/xudamopejine.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/gizubibug.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109211535257631.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/banorirewuweligepujibaja.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/xawam.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613319d8796ea---tenipugop.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/26506909721.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/15638720953.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/bitukesegunusi.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/43961266930.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/53422846808.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_off0000cc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 10580 bytes
SHA-256: 191a70cb10e1c2b81a4a37b78ccf65de3246e4a4938a9cd460ffdaaddba13261
font_02_sfnt_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 17892 bytes
SHA-256: f34be36a8c259dfb67ccf00a2e4824f670e68c99fa1568f7099a5e6fda6ac942

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