Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb8c7bc2c3ce178…

MALICIOUS

PDF

77.5 KB Created: 2021-07-14 00:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10580aaa808ac3677a87b7b1a6f308e2 SHA-1: 27c7b06dc6bfdba51194dc9d1440c860eeb92536 SHA-256: fdb8c7bc2c3ce1786ac4c2c84f0b06b630befeaf83e805d9bf49d87cec38a59d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as malicious and a machine learning classifier indicated a high probability of maliciousness. An external URI, https://cructi.ru/square?utm_term=dramatic+and+verbal+irony, was found embedded within the document, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of the malicious URL and the high detection scores strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cructi.ru/square?utm_term=dramatic+and+verbal+irony
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecb763b5b6766af3e259f1/1626126179546/can_you_have_your_license_plate_in_the_front_window_in_texas.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ede353f6d8087912befec4/1626202963882/pexevinerodufamadobavijom.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec841531b0b43e07e6dc13/1626113046026/61154650078.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e965d112fb7d0b279560dd/1625908690176/into_the_wasteland.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e88ef491a9976fca490b62/1625853684166/nellies_private_dining.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e945a1f4fe78435a3bddba/1625900449915/vugudosenararujogiduzinid.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee029110369373fd87c9b0/1626210961115/numerical_methods_for_engineers_sixth_edition_solution_manual.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edc79e80caa629c1d9c525/1626195870598/26132181678.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e85abe92396d256b272550/1625840318352/right_bronchial_artery.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec85c6950202184f10db26/1626113478506/find_the_linear_equation_from_a_table.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee08468443ee2c893485e9/1626212422565/how_to_connect_alexa_dot_to_bluetooth.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8efecb630645a0ef51d3a/1625878508506/rules_of_integration_multiplication.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_off0000ce27.bin
68ec7634522a82adbf169c6f95d26c8eff046c031634ac76371edbfe77212602		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 16268 bytes
font_01_sfnt_off0000f7d3.bin
29264aa95c1d5afa916aeb17b9e76b822e851e6631a012326b01bb0865628500		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 10684 bytes
font_02_sfnt_off00011055.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 16792 bytes

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