Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a5e36516b5c106…

MALICIOUS

PDF

79.3 KB Created: 2021-03-28 10:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98839eb019a9265315b291bd05708160 SHA-1: a4c10846b164e9ac713a08510ffbc55e823f962c SHA-256: 39a5e36516b5c106bfd1d2992aeafc5959dfbcee65344b4b45c189a507a7513c
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation, suggesting it's a crafted lure rather than legitimate content. The embedded URL is the primary indicator of a phishing or redirection attempt.

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://golowaki.ru/wix?keyword=city+of+thieves+pdf
    • https://static.s123-cdn-static.com/uploads/4369179/normal_5ff5e53ce46f8.pdf
    • https://cdn-cms.f-static.net/uploads/4460241/normal_603eb6d21bb02.pdf
    • https://cdn.sqhk.co/xogovofofi/ihpygd4/leon_s_kennedy_wallpaper.pdf
    • https://cdn.sqhk.co/fegujajox/hb356V8/easy_vanilla_cake_recipe_without_cake_flour.pdf
    • https://static.s123-cdn-static.com/uploads/4392463/normal_60036e0da88c5.pdf
    • https://cdn.sqhk.co/netimawifes/gm1gjAo/nixufubuw.pdf
    • https://cdn-cms.f-static.net/uploads/4483083/normal_60152a6f8733e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_4b9823ece80a431084888111fb00464e.pdf?index=true
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_aa2226ded16d4f759538b9898cdda147.pdf?index=true
    • https://s3.amazonaws.com/debamijizozexo/jadawut.pdf
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_ea5be8f8d1814e83ad4beb4b73767d86.pdf?index=true
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_262748d4cf1f4d45b182cd59a7e63169.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e3599db3-1a73-4d0c-8456-10dd197f3164/plantronics_backbeat_pro_2_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/3628d962-8d7a-4aeb-9365-c405b7796f47/explain_the_social_contract_theory_of_the_origin_of_state.pdf
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_1f5d9c596cd943cb8ed0526424b112ff.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_3c4fc82010be4f02a2f762748d6f1600.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bbcae0f9-27c6-45cb-859e-a8ff181791f8/wowetigurenajibidef.pdf
    • https://s3.amazonaws.com/wurivuve/green_leaves_powerpoint_template.pdf
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_f0734d9a77a64937a21b1611bfef7d06.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cf926f2b-b92a-47e5-9365-f87ab86f3eda/breaking_news_in_india_live.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_off0000faa3.bin
7b48de8c2fbde0c8b0346bbc1d90c945dab551855837db13fa51fabb1805a959		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 4860 bytes
font_01_sfnt_off00010b40.bin
ecaf17fae669c32c4d3f27c0958e2dc2e1023bce5fec47e9b657063cdd6e07d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 10932 bytes

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