Malicious PDF — malware analysis report

Static analysis result for SHA-256 b880645cc7ea61b2…

MALICIOUS

PDF

73.8 KB Created: 2021-07-21 03:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c0d9fdc1cc7273e6320269ceafe9cad2 SHA-1: 732b030c5d265f987b6b5ca9011dc164eee3edc4 SHA-256: b880645cc7ea61b2c5b59df9b37643ea64c287dba0d8b90481bff5681db9b381
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. A heuristic identified an image lure linking to an SEO redirector, which is a common tactic for distributing malicious content. The embedded URL, while marked as benign, is part of this redirection chain, suggesting a phishing or malware download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/u8n3KCQdUYc/square?utm_term=shriver+and+atkins+inorganic+chemistry+5th+edition+solutions+pdf PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edea123e01114371298d89/1626204690837/my_year_with_salinger.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f22312d68f3225904c8c1f/1626481426944/56645218662.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ede8f5a9d1f62037e3d102/1626204405491/beros.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f2cfa8668793736d2ab521/1626525608419/80809612664.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f76ed9223d2f64da750037/1626828505741/letter_for_parents_example.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f60d9e3e40a868cd601ba1/1626738078724/18348355786.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f731c560f20a47e6501f32/1626812869864/vocabulary_for_ielts_anneli_williams_free_download.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_off0000bcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBA 16424 bytes
SHA-256: 540e6cc55781c6cfe81c96a2f818aca5571d4207aeaf3d73f8282036f88f1f07
font_01_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 11648 bytes
SHA-256: 82274fc065d159e65249276a33b83abe50cebb2746353805fda5c023da92823a
font_02_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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