Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff14cfb4fe6f5db8…

MALICIOUS

PDF

89.1 KB Created: 2021-07-23 00:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fb384b30f85ab6c05406212dd6772b2 SHA-1: dd4cff5a8df53ca0424d31b2bd08e731d844d138 SHA-256: ff14cfb4fe6f5db815fc1deb0904ee55bf7fb41b771f433622e213fedae8a588
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs suggests an attempt to redirect the user to a potentially harmful site. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/uzX87CUNjRg/square?utm_term=exponential+growth+word+problems
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f604124086a50d17e7b8fc/1626735635060/59809688084.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8c0ab6955380ad9e6b1e3/1625866411303/baby_can_sit_in_which_month.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f27b26fb6d8f5e804f8fea/1626503974969/net_operating_income_after_tax.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8bd621baabd329ba518b8/1625865570576/belixexesi.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9321fb68d8f0f4bf8d19f/1625895455637/fuzisopakekojuminagale.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f5939dc28e8216f98174ee/1626706845177/electric_slide_instructions.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f3c13326e2e727c2668a97/1626587444095/77933131036.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f05b7e418af410b26b661e/1626364798907/convert_to_tab_delimited.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee51290981f36585a36e34/1626231081679/52626428913.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f22251503a216717851457/1626481233373/momazuwobotojebo.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0ae646b9e380665690dc2/1626386020486/vopareruw.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f50eaa3a33e4096df0b866/1626672810206/media_box_apk_download_android.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f8992ef678254b078198ee/1626904878455/bacteria_which_fixes_atmospheric_nitrogen.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e926f9c0906550d90b622a/1625892601397/23217875393.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed37d30124a666ff419f66/1626159059568/class_3_evs_question_answer.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f486606f491d4a1ffe0fe2/1626637920981/a_software_engineer.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f283f89ee5897bff99dbf7/1626506232838/72686003291.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f9dd7b3623573d5c8eeb4e/1626987900155/93987698711.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c2293e172817b39c2ed8/1625866793168/marriage_anniversary_wishes_with_name_and_photo.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f90a0c50b1cd2c5b753007/1626933772602/strike_pack_instructions_ps4.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_off0000f43e.bin
c2f257056337d7123e04e8be4eb1960a4136ebe3714e2d077a2dbc6c791c713b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 18508 bytes
font_01_sfnt_off000125dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 16792 bytes
font_02_sfnt_off00013df4.bin
98b807d306c929a4d4f8d90b3aa7eb13ceab0ab210bdfc047a4bdfae7574ff53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF4 11152 bytes

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