Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb897981d28ee71…

MALICIOUS

PDF

83.9 KB Created: 2021-07-22 15:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d34c189a693bc4e2826d04545dd54f6 SHA-1: 3b8a7867284b09078c597d81efbc37f80601b8b6 SHA-256: cdb897981d28ee711ec180f12a6a0f1880a7ce38f96b425fc915c270f38462dc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded URLs, though many are marked as benign, suggests an attempt to redirect the user to potentially malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://feedproxy.google.com/~r/sq/ugae/~3/qQn0o4eTdIQ/square?utm_term=main+character+of+the+tell+tale+heart
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f016b40dea5e4896be07b4/1626347188655/93303306178.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e923db854c1d3b34870ac6/1625891803997/zejizejigom.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e836a180504e0a776d849b/1625831073203/42789175910.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f2d17f81f38b2058805605/1626526079245/toil_meaning_in_english.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ede2d0a9d1f62037e331c3/1626202832932/vonegov.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f7b7c6df42ba2c7ad5c0a6/1626847175254/structured_analytic_techniques.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f904b0a663f73b0a5bcef6/1626932400234/viridomifufubekifeve.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f7fce4d401bc6ded2cabb8/1626864868703/40587763754.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0be9e8bcf896c91591483/1626390175035/63075598328.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f601c184090146d651ac40/1626735041723/nawijup.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7fd4a1873c46ac93af3fa/1625816394517/spanish_tenses_review.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f811fc592bc62482f22954/1626870269746/simple_hypothesis_definition.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7bb5f1d61f435cef63324/1625799519365/impatiens_yellow_leaves.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f70459f3decf6e74ae34fc/1626801241477/bibubanoxo.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1c4f751effd6a055ed1a8/1626457335666/44745795131.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f2ab4e6167905317d3185b/1626516302180/sisesatuvazaborilonidizu.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1741fb3a282695d36374f/1626436639967/things_to_do_in_mcpe.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7a1b24454ab0ddd82c8d3/1625792946357/some_articles_in_english.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f60b3f19d3d649d88ae839/1626737472065/software_testing_interview_questions_for_freshers_with_answers.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f699cb1f75e014b6dec0ed/1626773963554/a_spool_of_blue_thread_study_guide.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f5f584f49404694e05e6b6/1626731908661/yet_to_complete.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f0c8e84be5f74a98db1621/1626392808192/kylie_and_baby.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e499.bin
aa241d22352ed27069f5a5343f462121b123c847a4d4bb4c3b2d8679be71263a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 10260 bytes
font_01_sfnt_off0000fb94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 16792 bytes
font_02_sfnt_off000113a6.bin
6a692d7976f292c3b85ab4d9db9dbac2c9569cee6e9c2f3ac630834a9513f3f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 16824 bytes

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