Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83c113e66a25bc7…

MALICIOUS

PDF

86.1 KB Created: 2021-07-22 01:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 75512d441c1d6110b07542899618fd7a SHA-1: 60e0515789dc10a63322fee7ea39af5efa3106ad SHA-256: b83c113e66a25bc7f4dedbc8864c251814676af3235df74d004bcb62d1e66a8a
76 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it uses an image lure for redirection, a common phishing tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of an embedded URI pointing to a redirector suggests an attempt to lure users to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/iXsW93xxTQA/square?utm_term=the+golden+dragon+chinese+food PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f5d39b08ddf246b9f1ce3e/1626723227437/vebapiwopigijebunutobu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f5d7180e0b8d05115b86d1/1626724120667/dua_for_chest_pain_in_english.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f3aada668793736d358ea7/1626581723097/what_are_the_two_alleles_for_flower_color_in_snapdragon.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f19f31b1cb8209d17eabfc/1626447665976/kojiramubasepomevozumuj.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f46644952f835132dfd586/1626629701039/sozejisam.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f8966dc6602469554096f4/1626904173241/25019028690.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f57b90ec5ad00cc0a9c795/1626700688569/feduvotupug.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f1605d46c0d74f87e1132d/1626431582443/61854770062.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f7df86f668a559cd993a5f/1626857351120/divarawuxijadusemo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f68b4876d252303861e381/1626770249057/diffusely_positive_meaning.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f371baec5ad00cc091c130/1626567098138/70392403809.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed935667dd777ebfc37dd5/1626182487050/53146449900.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f88fc2bfcf5919e95380ba/1626902466886/play_3ds_games_on_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eff30816a6d35a11126d37/1626338056297/55958303112.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eda81637bfc37e3c242ce4/1626187799120/25651719057.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e9281f2a6f785f5834a07b/1625892895686/at_what_week_do_most_miscarriages_happen.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7cae3d93aeb546a13aabe/1625803492064/world_photography_competition_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee39b6e7148d06bc70a790/1626225078360/psp_games_free_download_for_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee404f86aa876280bcda91/1626226768005/name_symbol_and_atomic_number_of_first_30_elements.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f777613fe7684a17b6896b/1626830689819/money_laundering_control_act_of_1986.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f5c9b72cf7fe79339608da/1626720695301/65596526665.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec942736ee212f66cfe72c/1626117159269/duxujidujaxojanoko.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee345ee03b615e098d9a19/1626223710402/dowanekusisoniromugajo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e904218ce0e10532d19cb2/1625883681500/zewaled.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 16868 bytes
SHA-256: 5684237e2fccb6606aa54f32a5fa16ed2ad5a3aa8543f57fb20c792729ed3a7d
font_02_sfnt_off000131e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E4 10620 bytes
SHA-256: 0277b8337a137e0ec8cfd4ff0450a564590e546f72c57a8fdc72688a06b364a7

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