Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8ea3fc59a3d278…

MALICIOUS

PDF

77.3 KB Created: 2021-07-17 07:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be0401ee3b02285b2e2bf16bba3fe9a4 SHA-1: fea23305b6ad4ea6cb2fd5a93bfcab7a4597546f SHA-256: 9c8ea3fc59a3d278a5b0f8f179d5ba13271642e3c8e66eba4efeabb05612548e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains multiple embedded URLs, some of which are flagged as benign, suggesting a lure to disguise malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or trojan delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

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/razvivatel/yapz/~3/XMoLd4EPXkg/square?utm_term=which+of+the+following+is+not+true+of+ordinary+repairs
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7702b6dedd3ae167844b/1626109698952/class_10_disaster_management_book_free_download.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9d9de4ca3800a11a05cd/1626119581762/13826552075.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ecb83a104bab176fa91c37/1626126394320/learn_japanese_with_minecraft.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1569815846f0d14ecdd0c/1626429080626/sal_y_limon_hours.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8d800c81c3e1fd72a3931/1625872385057/87978868134.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7721d9561735a16c4caad/1625780765271/charity_shop_furniture_collection.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edebc8d6548a387fd4768e/1626205129245/how_to_solve_for_x_with_fractions_on_both_sides.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e79cc8b977dd1475c65811/1625791688880/tinea_infection_in_groin.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f1eeb003e0235aaf4c0b4c/1626468017104/trailside_at_reedy.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec90b6def1ca41d5fa226b/1626116278117/olivia_meaning_in_spanish.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edbee280caa629c1d90575/1626193634149/ghatna_chakra_general_science_in_english.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_off0000cd79.bin
28e5e7a8c618d26e8ea6c319e8a7eaedb19b59c7e25d7353a9a3574b07dabafa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 11192 bytes
font_01_sfnt_off0000e77e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 16792 bytes
font_02_sfnt_off0000ff90.bin
f75f94bd9eebee22597f03fb751231184d1b1088c11914fafa8cf2c3dc5a518e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 15940 bytes

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