Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbcb60afa4b5d9a…

MALICIOUS

PDF

80.8 KB Created: 2021-03-31 01:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aa83e03b9267eacdba2e0f0635165bb SHA-1: 20dffb2f5532cc2a4289611192ce23ff34c71120 SHA-256: 5fbcb60afa4b5d9a922a18ceb5676be816daca04c061341ae0168316015883a8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL and numerous other URLs suggest a phishing or malware distribution scheme, likely masquerading as a helpful document to trick users into downloading further malicious content. The document body, though heavily obfuscated, contains references to 'Adams tax form helper download' and 'wkhtmltopdf', suggesting a lure for users seeking tax-related assistance.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=adams+tax+form+helper+download
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • https://cdn-cms.f-static.net/uploads/4368971/normal_602da7deb2664.pdf
    • http://auto-agents.space/225736383450hmdu.pdf
    • https://static.s123-cdn-static.com/uploads/4493266/normal_5ff0dda7f0159.pdf
    • http://fredo.bike/kulagofofozogudoxawi2srol.pdf
    • https://cdn-cms.f-static.net/uploads/4447497/normal_603029b9c4e6f.pdf
    • http://vizit.store/40066773564vmii9.pdf
    • http://fb-copyright-help-from.com/vanobedexepedaxegupefewtj3o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f1df9f17-50d8-49bb-9dd6-1a17d0294f7c/45262027961.pdf
    • https://uploads.strikinglycdn.com/files/3f7f6a6f-11bc-4aa7-8442-185e1cdff4f8/how_do_you_use_a_bissell_proheat_12_amp.pdf
    • https://uploads.strikinglycdn.com/files/777158c6-53c0-4022-b8ec-64cc3a7e8983/69098402209.pdf
    • https://uploads.strikinglycdn.com/files/5a573517-f7f8-40f4-9b11-4643b5dcea09/51964117331.pdf
    • https://uploads.strikinglycdn.com/files/4e2eb21e-f33a-4676-80a5-9efb81644c3d/smile_bomb_sara_white_mp3_download.pdf
    • https://uploads.strikinglycdn.com/files/db6561dd-cb24-4eb8-98c2-53c1a091fff1/69190382143.pdf
    • https://s3.amazonaws.com/kokesatodixon/catapult_king_mod_apk_home.pdf
    • https://uploads.strikinglycdn.com/files/51e8280c-186e-44c9-9f4e-5b0adde965e2/butidogejifabozokiduvujuz.pdf
    • https://s3.amazonaws.com/rirusozo/raxerikovulusoje.pdf
    • https://s3.amazonaws.com/xefejevife/how_to_use_chameleon_hose_end_sprayer.pdf
    • https://s3.amazonaws.com/kezemiradigu/19170276070.pdf
    • https://uploads.strikinglycdn.com/files/bd17cf3a-2118-4704-b8af-4b16c037a738/marshall_mg100hdfx_head_manual.pdf
    • https://uploads.strikinglycdn.com/files/cda5df94-9c71-4be1-8b00-58d28525fd81/tiwuwu.pdf
    • https://uploads.strikinglycdn.com/files/39665703-f994-4f78-839a-05bfa7aee630/jazalewe.pdf
    • 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_off0000ff85.bin
9020d4a693f033bb88b50caba503ad90f554ec5db4a1f764029f460732cc67aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 5428 bytes
font_01_sfnt_off000111e9.bin
2cd63891eb23875c6dd264383807abfe4bcc735ba47d2e3bfdf6ed67438a59d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 10664 bytes

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