Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf5ac6fe59489d4…

MALICIOUS

PDF

133.9 KB Created: 2021-07-14 00:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8e42d398b6d206c1f165a8ec67ae14be SHA-1: 7e7a36585182f25e845f6c076deb74ddacc081dd SHA-256: fbf5ac6fe59489d4627b0277229b25df93e2eae50190fdd6e30e12dda2e4a39b
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically points to an image lure designed to redirect users to a phishing site. While no scripts were extracted, the presence of external URIs and the overall detection suggest a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9555

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/qI_NY8u86tA/square?utm_term=transferring+sprouted+seeds+to+soil PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edd5849779423221ded847/1626199428861/the_most_dangerous_game_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ede3b9670c344ea75dae0d/1626203065419/oh_my_god_full_movie_online_play.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8ca491102953de5830b8e/1625868873429/99932249906.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec80a37a1add4dee1f3d41/1626112163225/how_many_eggs_do_black_australorps_lay_a_year.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8b6b1566cc9679b7ea53d/1625863857973/nebivedanutumosozemija.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed9056c1f2f61945a586dc/1626181718529/substance_painter_draw_normal_map.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8f10466be7e490f0d6eca/1625878788199/after_effects_2018_crack_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e965595ebba154a8fe5f0c/1625908569634/63083734144.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60eca8045338e9546e4a9b90/1626122245142/13563791501.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_off0001aa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA09 10736 bytes
SHA-256: 690ca5c76e8c44f951d2b0c2b8ae2cb104ce68a028cc5b824e9ab1ea58d66a6d
font_01_sfnt_off0001c295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C295 18180 bytes
SHA-256: 53099283817844fce8f5c59f223f2bd2aa3bdc9ec77feb09c989d0986c125dbe
font_02_sfnt_off0001f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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