Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa28ef476c348b4…

MALICIOUS

PDF

93.0 KB Created: 2021-07-14 03:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: aba71c226391ec959240959baba3a767 SHA-1: 4b275d685785cd4f44e689806035adee7da40684 SHA-256: baa28ef476c348b434d2d9adad16a472ebbec0fbc12b9cdc80a59284d2a1b5ed
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains an image lure that redirects to an external URL, likely for phishing purposes. Although no scripts were extracted, the PDF structure and heuristic firings strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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/rCno-htTzZk/square?utm_term=persona+4+the+golden+animation+characters PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec9927934d360eb28a4413/1626118439385/89106294309.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec80ce72e2584f24630f94/1626112207091/if_3_is_a_zero_of_the_polynomial.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7f782d0799e4214c18e03/1625814914453/if_two_waves_of_same_frequency_and_same_amplitude_respectively_on_superposition.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edbb47629ffd0e3632b651/1626192711979/heaven_came_down_and_glory_filled_my_soul_hymn_lyrics.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edd70a30d23a75506286a3/1626199818949/design_and_transition_itil_4.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e929a927127e680416439d/1625893289957/do_the_people_from_60_days_in_get_paid.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee2069df3d323292ce7098/1626218602111/mantra_biometric_finger_scanner_drivers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed3bce7ab2906137d3f196/1626160078373/ib_biology_command_terms.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_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 16616 bytes
SHA-256: 417de9209473d842c796661d63ab32a8aea42cf12e9702f1cc48ccd76e6360f8
font_01_sfnt_off000136be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BE 10896 bytes
SHA-256: cb85f015d118d4dc522aa24b99113e846d09b6ee1e9c8c2f1dab17419f4d944e
font_02_sfnt_off00014f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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