Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b5a11bd03eee43…

MALICIOUS

PDF

82.6 KB Created: 2021-07-21 08:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 325e41bb52c8179bff86a988f22664f7 SHA-1: 2789ff84d2bd740a14cb9f6f030aff32b095f40f SHA-256: a0b5a11bd03eee437d7a2d1fa2e3df572dd46efbe0750b01aa2262e34c03acb7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded URLs, one of which is a Google feedproxy URL, suggesting a potential phishing or redirection mechanism. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classification point towards an attack pattern involving social engineering to trick users into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/XMoLd4EPXkg/square?utm_term=samacheer+books+6th+to+12th+download
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f67e203b8c3407e1b13957/1626766880097/cross_laminated_timber_construction.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f16a6496ce9b33d7334464/1626434148437/nasedokunimefofisakiri.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f75d83968f9f6b397147ce/1626824067345/so_in_the_meantime.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f7a99453df297156b40976/1626843540912/level_3_logo_game_answers.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f655cb4920142c5d9bc12f/1626756555244/kratos_gets_blades_of_chaos.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee2c07a005482cc1552838/1626221575525/heart_of_darkness_answer_key.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f55e1ac2d40e67ec227825/1626693146451/how_to_write_invoice_letter_for_payment.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e814b1efb14d112213b4cc/1625822385204/gate_chemical_engineering_2020_solutions.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f5a347dc9b467aace6d323/1626710855660/shopping_in_agra.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f657ca66e8821a32c432d8/1626757066774/51296590734.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee483aa005482cc1571a05/1626228794762/vikoja.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f4e05526c2747482f257c1/1626660949762/free_countdown_timer.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee65acdf274736e0ae215c/1626236332396/breviary_morning_prayer_for_today.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8c4348f67167615ac4fc1/1625867316864/jinexalosup.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_off0000dfa4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 16792 bytes
font_01_sfnt_off0000f7bb.bin
ca49c5b9de12e1a4925036f71f1a5a2dd9a0d80adca8ae4709c63bb0c0a4e10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 11276 bytes
font_02_sfnt_off00011228.bin
6f652671231b4e2cb1b72b62d920293bee3fc8a47ecae38470e8d3348a346e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 16704 bytes

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