Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5404cba43a3b32e…

MALICIOUS

PDF

81.4 KB Created: 2021-07-22 10:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c4f06b312d5cd92d65a69d4d6b0d63a SHA-1: 307452b9746899079d288fb8dfd033fa96c84bd3 SHA-256: a5404cba43a3b32e8c6a445f78c3bae7b57193d3061c9d9f008b39f267e40953
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 and embedded content suggest it is intended to lure users to a phishing site. No scripts were extracted, but the presence of an external URI is a strong indicator of malicious intent.

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://drafthe.ru/square?utm_term=how+to+save+passwords+in+chrome+manually
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee3950537273346e2f4937/1626224976574/how_to_compile_c_to_exe.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed1be8fb5306426ecb3fa8/1626151912588/43765565464.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f2c1d2a9adb728039ffbf2/1626522066588/59776772540.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f3fb9432548145d79103f3/1626602388983/sizikulejewe.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee8094f72ce0266e138448/1626243220558/celta_assignment_2_answers.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f89ed624c5f82eff49e39e/1626906327010/to_be_trolled.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f257f22be78d5265911e39/1626494962595/simplify_complex_fractions.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee87542485902f3e778957/1626244948382/elapsed_time_meaning_in_car.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f42faa783e880aac87e426/1626615722855/sesavevu.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edb9e37fd27645e98c724f/1626192355487/internship_certificate_format_for_engineering_students.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f4cb9b689a653fd2a8943e/1626655643652/37093537850.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec952e69d4b63361487fa2/1626117422560/youngs_chinese_food_carryout.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f682213fb69e7128f806f5/1626767905329/21629152482.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f8e22c3dc1753e7ba65c72/1626923564907/toxoplasmosis_in_cats_symptoms_and_treatments.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60efe6d64980ba6b3b6da2b3/1626334934160/can_i_mix_semi_gloss_and_satin_paint.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8fccbc4c1a734c5d5375b/1625881803926/3419855031.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0ba016e32095df97d5bf6/1626388993699/always_get_the_hiccups_after_eating.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f09c96f3204a3f57ecfca0/1626381463334/wogosamomofa.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e779773541515a6004115d/1625782647759/ravusuz.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f49f563a33e4096dea8afc/1626644310193/perry_mason_the_case_of_the_wayward_wife.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_off0000dbb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 16792 bytes
font_01_sfnt_off0000f3d0.bin
f9050a81796bde641b0dada480c59108486629f559e2e645fcb1c38e4783a11f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 11136 bytes
font_02_sfnt_off00010da1.bin
3cb79111511c03e6faca985df7e9bc74391c6ab6dc8d97e722966de017c1ff14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 16460 bytes

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