Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a808408d57fd3d…

MALICIOUS

PDF

79.8 KB Created: 2021-07-13 17:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50b685bea6d11a6ce7f8e30aee5d95ce SHA-1: 340c643a0bc458bcf0e0d6edfaed8729ebdc1ab8 SHA-256: d2a808408d57fd3d0f7008e6f41303af2522815ff9d936e01507531bed9f616c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains an embedded URI pointing to a suspicious domain. The PDF structure also indicates potential manipulation with duplicate object bodies. The primary IOC is the external URL which likely hosts a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

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://allytemp.ru/square?utm_term=will+pansies+last+all+summer
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8ffa2309bd63f3d84b2c8/1625882530975/5_layer_network_model.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed8ec00318596fdcc528aa/1626181313113/mission_bay_shuttle.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7a4712c1416d2f19d4a8/1626110535156/moral_but_illegal.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed990ca5c02c6ff4da0761/1626183948683/zemusitilufapizo.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9448ae370ac63228a0bc2/1625900171076/confused_meaning_in_bengali.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8a08c082d905bfad8ffdf/1625858188952/text_structure_practice.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecfde1f67381323ef23f98/1626144226029/most_alcoholic_drink.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed8188c50d503b9d58d442/1626177929134/just_ducky_1953.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_off0000da7c.bin
626de432880d4f04cb768de3ad0cd32dd0ce76a39e11a1d7e99cfdcb28e60fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 16040 bytes
font_01_sfnt_off000103af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 16792 bytes
font_02_sfnt_off00011bc6.bin
c6266ff8833a5176492d18be4aa45920ecbbd735aa08e433888a84cc083038da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 10388 bytes

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