Malicious PDF — malware analysis report

Static analysis result for SHA-256 af61858457fbd4a9…

MALICIOUS

PDF

67.7 KB Created: 2021-05-08 06:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9f741478cb1529b25f6d423764caf1c SHA-1: 2104415f0ff5039a997398731cb9b3387ed23b42 SHA-256: af61858457fbd4a9cce1411db1ecb0b4bd6f34b6364ea700d192d76f6b5dd4ae
96 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains multiple embedded URLs pointing to other PDF files, suggesting a downloader or redirector pattern. The presence of these external links indicates an attempt to lead the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090e6a2e7eff---547303499.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/97248656977.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083483098aeb---71104308663.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608684d80e96e---77366442671.pdf
    • http://abacusnancy.com/userfiles/file/3629357941.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fe45b8b4adec3f720b51d9e95635dd94/93471845998.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/04fa1e75a3cb3e1e0020b141971854b7/46365266750.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071702bd6e1b---peravobuwawa.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ec639a493---86508248893.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf552a50dd---bogukejasunupetirut.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f5a5c6382a54804ba980baf529ff20e5/59185850123.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4152de6622d2b12e01dd90b77b9ee343/puxijovisovagiguzotitir.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/1269247096.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3dd3ba65aa0cb71c925e1b5b66f0c2f7/zirifesufofateval.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+batch++from+sharepoint
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca2c.bin
fa1467c27cc55267e1818ac5c59b400ddb71079f5b1877f719091492fce841c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2C 5416 bytes
font_01_sfnt_off0000dc81.bin
68739c0beb52356cfa750c087c5fc09f605aeeb62b7171b2b34735de64bd7a70
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 11040 bytes