Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fe7d2582bf0c90…

MALICIOUS

PDF

79.9 KB Created: 2021-07-21 00:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5653c8d4452e2c5a340d53a042ff1d4f SHA-1: 0a1cdb459e358296d2823abb27f2ab4e419cd4dd SHA-256: a2fe7d2582bf0c9073f830f96c34ab1a2af115c6b3ee3751e0338193ef8be670
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified an external URI and an image lure linking to an SEO redirector, suggesting a phishing attempt. The document body was unreadable, but the presence of a redirector URL points to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

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/qQn0o4eTdIQ/square?utm_term=michael+jackson+santa+claus+is+comin+to+town PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8fa1c27127e680414379d/1625881116272/arabic_to_english_dictionary_translation.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec860fa1f8f93f64ac0bff/1626113551170/burikixukuteworaxopewefez.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f744d09373ee647a489800/1626817744395/komurexoxu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f59e6ebf110d63cc7a913b/1626709614280/75443760189.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f6c319e03aea67d4a1c6fc/1626784537399/tugexugabapozeg.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f05f09473e18288dc77db7/1626365705611/scriptures_about_gods_mercy.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f4b2c954c26a0cc30b2f35/1626649289799/pajipab.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_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 17232 bytes
SHA-256: fa11f602166f1ea69f2d6e01f7cb95392067b1ad23f71c62812c877fa2a7328d
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 10796 bytes
SHA-256: 00d5ecf03f5ef27f18d5f93419da72dca470374fb20f5dd554df8b910c359fc7

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