Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d257c99cff228b…

MALICIOUS

PDF

114.7 KB Created: 2021-07-22 04:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60474c976066db6c5db053df8154f95f SHA-1: 36fc08ffc6f88afa26527a5d3f5d1d69af3a9237 SHA-256: 39d257c99cff228b2ea6e8ce0beb8ec1a1911ff02d9680e7ea8d714bf24e0e22
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded URLs, though many are marked benign, suggests a potential phishing or malware distribution vector. The file's structure and detection by ClamAV as 'Pdf.Phishing.Trojan' strongly point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://feedproxy.google.com/~r/sq/ugae/~3/jEScUJLm1bs/square?utm_term=probability+and+statistics+for+engineers+ravichandran+pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edcbfc3e01114371263a01/1626196988836/17033278636.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efe289d77757041652684a/1626333833891/87.5_as_a_decimal_and_fraction.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e784dd8987cd14932270d2/1625785565739/grade_3_math_word_problems_worksheets.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eda7613680ef421b55a8ed/1626187617962/6th_standard_tamil_guide_download.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0b78b6c706f161d830e98/1626388363147/sonic_unleashed_mobile_apk_download.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee82791f51426150d0d423/1626243705544/ankle_still_swollen_after_3_weeks.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e84f9330ecfa0852d573de/1625837459227/imovie_how_to_add_text_over_video.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f614104742d44d706cb2df/1626739728392/will_and_desire.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edb8cf8525735ba0d46491/1626192079296/83602812981.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0cf30b348e55d1c4ca620/1626394416464/75799695939.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edf63a895aae42f65cc08d/1626207802562/can_i_pull_out_a_loose_tooth.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed884d2ae47d2ac924104c/1626179662176/care_and_concern_meaning.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60effaf796309e3685aa8e0c/1626340088007/rhyme_of_the_ancient_mariner_summary.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f089ab829bd105fae8e424/1626376619866/give_two_examples_of_unicellular_organisms.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edbe37d9d5ad70ebceee08/1626193463724/seed_of_abraham.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f16061311eab0d81ae4934/1626431586081/28885555540.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f4dfe5b84a576e6c122b92/1626660838161/28836047456.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f710d5c04b946e145f204f/1626804437452/37907536164.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec904044349d7bb06d4e59/1626116160538/86657910015.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_off00015a61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A61 16792 bytes
font_01_sfnt_off00017278.bin
9dabcc8bb1fb3ba98aa88bf09df4aa9765a5b35387de9416f098bafbf33b61e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17278 11220 bytes
font_02_sfnt_off00018c4b.bin
9fc6664c6059f61368b68c24f607c5ddad0ca7ee5f97c0659a6ed4c73005a727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18C4B 17380 bytes

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