Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5c3603f1ffdea7…

MALICIOUS

PDF

86.3 KB Created: 2021-03-19 17:07:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bf80023d07b596bccabd0176063b6d6 SHA-1: 95aab2cf81deac545a517943dbd451a335ce1974 SHA-256: 1b5c3603f1ffdea7af3ee8a6a45103c0406ab29492a9eaee93e461959b3caebb
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for a phishing trojan and an ML classifier indicating high maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document likely prompts the user to call a fraudulent number. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document designed to exploit user trust for financial gain or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/wix?keyword=us+migration+patterns+ap+human+geography
    • http://originalhallyu.com/biochemistry_made_ridiculously_simplekpuys.pdf
    • https://sidunijutama.weebly.com/uploads/1/3/1/1/131163786/mazobo.pdf
    • https://cdn-cms.f-static.net/uploads/4423700/normal_6035970de73a3.pdf
    • http://podipotekoi.ru/what_does_neuromuscular_incapacitation_meanrtxun.pdf
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fe0b7b063850.pdf
    • https://cdn-cms.f-static.net/uploads/4369654/normal_6049c14cb9cdc.pdf
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/tigopimonemata.pdf
    • http://nicepics.xyz/25095787143hb76v.pdf
    • https://volokosebu.weebly.com/uploads/1/3/4/8/134871595/winezirafemofi-zorozijebapuju.pdf
    • http://iranianvc.com/wosapanezuvumk7ed4.pdf
    • http://storeeuro.info/87644088157ermel.pdf
    • http://forsage.pw/how_to_install_k_cup_reusable_filteru1vul.pdf
    • http://podcard2020.site/community_trust_bank_lienholder_address8hrfg.pdf
    • http://helplnstagramcontact6088756.com/fewitugomesqpi2s.pdf
    • https://pedigujelod.weebly.com/uploads/1/3/4/0/134096449/c14a35932d.pdf
    • https://cdn-cms.f-static.net/uploads/4447096/normal_6043edc2915e5.pdf
    • http://molotkov.site/77857645145oxnoi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_73c122b9a8fe4115824678ba86fe6ca1.pdf?index=true
    • https://s3.amazonaws.com/vebenok/how_to_clean_hayward_3c_salt_cell.pdf
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_7187f6e0066a46219fe84c6a3e78423f.pdf?index=true
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_2326232485934a84a7c1f5660b2b2d1c.pdf?index=true
    • https://s3.amazonaws.com/kudowo/63843620563.pdf
    • https://s3.amazonaws.com/luxelula/21997310541.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcd0.bin
6480d87d2ed3774841806089a6b3a264d6b2f1ffd587ac684376cc00f6856416		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 5296 bytes
font_01_sfnt_off00010eb3.bin
3c9200adbfd94233f1626c7715f696ea2f99f9aa72b1f172372511da0dbdbac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 11164 bytes
font_02_sfnt_off000134d9.bin
f8e326b96df6c0457890c6346fd7f60b91beb129051a642dbd03fdf119a21fd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134D9 16116 bytes

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