Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe0320ed22ea16b…

MALICIOUS

PDF

79.4 KB Created: 2021-07-13 16:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0da6be6e87b39aef759ca8e34b52674a SHA-1: 17e218c141145cfd87c3d3e9a1feaf3918139009 SHA-256: efe0320ed22ea16b5b0612edca1b85e3e7f0e77215cc7798be222e7691e39fdf
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model indicated maliciousness. The 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic specifically points to an image lure linking to an SEO redirector, disguised as a free download. While the document body is heavily obfuscated, the presence of embedded URLs and the heuristic firings strongly suggest a phishing or scam campaign aimed at tricking users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8666

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/r_nBws6J8g8/square?utm_term=the+art+of+computer+programming+pdf+free+download PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed9348c2ef2d11c8d863aa/1626182472496/tokyo_ghoul_re_manga_download_complete.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed35eba17c7f1bf0013ea9/1626158571280/track_down_information_about_the_code_encryption_76.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec781dfe047727940a6683/1626109981968/make_cold_coffee_at_home.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecdaca67dd777ebfb956c3/1626135242138/cinema_apk_download_for_android_phone.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7b75d48fdc259403eebd7/1625798493408/ro_number_plate.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9414012fb7d0b279470a4/1625899328424/call_of_duty_beta_apk_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecdb4c7ab2906137ce9d53/1626135373001/self_employment_tax_meaning.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_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 11048 bytes
SHA-256: 92cd92bf98ec226ae2447058fee45daf4e622d78f58a4665ffbc6ed6a0154193
font_01_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 17048 bytes
SHA-256: 7623ef7a2edf37480efbf2f3a3badb5322d8c36ec92c539e22bc4f750661a28b
font_02_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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