Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fbab75823ae09e…

MALICIOUS

PDF

75.7 KB Created: 2021-07-12 23:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f62d3bc438eefb57a1ed4384d5e3ff71 SHA-1: 7713d59771cae8a76d9bef3454cd1ba337b82bcb SHA-256: 81fbab75823ae09edf8f0cfe5d0874114a7b9be949dfa1977222deaa572f1013
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it is likely a phishing attempt. The 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic indicates the document contains an image lure that redirects to a phishing site. The primary IOC is the redirector URL, which is used to lure victims to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8972

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://pistant.ru/square?utm_term=380+w+south+st+martinsburg+wv PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e84a643b27a31b5f33d319/1625836132388/how_to_find_my_files_on_my_computer.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e960fa83ae0c49023aef62/1625907450109/how_to_cut_your_ball_hair.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7fc5a4d2175279d14af9a/1625816155114/xoxidovojoro.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e776834ed836120c1a573b/1625781891428/the_execution_of_louis_xvi_worksheet_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec93b79c874e7142491aab/1626117047965/42506486669.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7e18948fdc2594041091a/1625809290039/76421201907.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_off0000c4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 16788 bytes
SHA-256: 9e6c0c6f2c8c4cc43f001c7782061d88c5eb18d752070fa59e62519e433c2132
font_02_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 11172 bytes
SHA-256: 501c9955cf35d503a311537b97e04712363e9cd76be9efa7317fac3ec0386f24

Open this report in the interactive analyzer, or submit your own file for analysis.