Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46aa3ca0f897287…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 23:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a144e91f56096bcf46cbe758a93bbafb SHA-1: e56c39b112ffb77c749d68063dd7deafd4ddd5d1 SHA-256: a46aa3ca0f8972870c8f2753e770bf0f4eccf9c909ff1b3c87fa226018e483e5
144 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a remote support lure, instructing the user to install or connect with such a tool, which is a high-risk tactic in unsolicited documents. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to trick the user into executing a malicious payload, likely for remote access or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7164

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://feedproxy.google.com/~r/razvivatel/yapz/~3/nCRFBnYrBHY/square?utm_term=build+your+own+army+games+unblocked
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed9a04c5e0b1320e341965/1626184197040/american_embassy_in_ho_chi_minh_city.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed94249117a44628bfd158/1626182692744/lauren_cleary_moment_of_truth.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed67d6c927da2a63fa675f/1626171350764/23453710469.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8c4ca596d362fd0fbff17/1625867466710/64667689943.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7fc7bdd82073f6feaf23/1626111943764/wawunevubedasanewaxifubul.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edc37ee635d716645ed7bb/1626194814171/equity_stocks_meaning.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e789b095719b356d8e0ad8/1625786800631/lunagud.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d596.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD596 16792 bytes
font_01_sfnt_off0000edad.bin
0be401e899d25557050e762647e310fdcafb4bb6e91a0ee1e5ab3c175d86dddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 11200 bytes
font_02_sfnt_off000107bc.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 16092 bytes
font_03_sfnt_off00011cfd.bin
ba3859f5e66ca398ff1a6eee13a2c34cf23ac494c14f8422180bc11e86eef61d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 17384 bytes

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