Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6ceea98bf3935a…

MALICIOUS

PDF

78.3 KB Created: 2021-07-15 19:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d42fd15fcbae7d175abdf12cd70478dd SHA-1: 5cd15156ca05ad723c088d7473563db4d336dedb SHA-256: ab6ceea98bf3935a4d191f3c420df6c248f7862c0f7e8e9dc4c634540fc8cd2e
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. A heuristic identified an image lure linking to an SEO redirector, suggesting a phishing attempt to trick users into downloading further malicious content. No scripts were extracted, but the overall pattern points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6980

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/razvivatel/yapz/~3/1LSSs5qy-i4/square?utm_term=aiims+protocols+in+neonatology+2019+pdf PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e790e328bb5f4f515ed178/1625788643207/hack_impostor_among_us_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e778034ed836120c1a7e99/1625782275512/what_is_a_describing_word.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f06331cd60116a3c38a646/1626366769506/department_of_education_student_loan_forgiveness.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_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 11520 bytes
SHA-256: 168127d5e73c34a07ee2c43801e48df7c263182d5fa12342ab692110aa8eda14
font_02_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 17304 bytes
SHA-256: d288cbd8d5b304360fdbdc3ee22403f71a0239996b9f74e790d0d565a8bc1972

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