Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d1d817a4de9ac9…

MALICIOUS

PDF

93.8 KB Created: 2021-07-17 06:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9895db6b41b8911aee9a1d51ea463592 SHA-1: b5616e932fe32ce8a993d8147b5cdbe72637c319 SHA-256: c5d1d817a4de9ac9ded05ec75881a72c0a5ade122825d76a5b40463886cbb6eb
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a redirector link, suggesting it's part of a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of a redirector URL points towards an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/sq/ugae/~3/X6hrLWyzjlw/square?utm_term=no+one+know+what+it%27s+like+to+be+the+bad+man PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0674dfa9d7013435d1c97/1626367821434/prosecution_opening_statement_examples.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e939c7b68d8f0f4bf90c83/1625897415240/savufufowisuwev.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e93457defa333328ab1700/1625896023421/another_word_for_strong_women.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f23a4e9c7c9f0ea98f3483/1626487374336/how_to_get_my_peace_lily_to_flower.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f1e2d653d31a11ced484f7/1626464983097/some_walks_you_have_to_take_alone_quotes.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e793a851cb2a526cf89d68/1625789352923/what_is_crowding_out_in_macroeconomics.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed0b3ffb5306426eca454a/1626147647460/watch_endgame_avengers_free_online.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f2469f29712869f05be457/1626490527673/paste_image_on_another_image_online.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f072961a769948b752e529/1626370711333/the_singular_of_phalanges_is.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed87e136a7a57c1cf46bb6/1626179553963/barry_zimmerman_self_regulated_learning.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ede46cd9d5ad70ebd307d9/1626203244869/88943100753.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_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 17000 bytes
SHA-256: c4c866d3f5936e9ac7abd6a0cd69e31573c3cf2a8a0c2475df7e83381be00447
font_02_sfnt_off000151d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D6 10744 bytes
SHA-256: 6c461cafd47886ffdbf83a54f67846afa411b68072d2d56257d3c11d7bfa346b

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