Malicious PDF — malware analysis report

Static analysis result for SHA-256 b630bd4bdb758724…

MALICIOUS

PDF

75.5 KB Created: 2021-07-13 16:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 24a1e7efae758ce1dc537af574f17d4e SHA-1: 130faf8302be66a0ca51185ae7d4b2f5acbcf82d SHA-256: b630bd4bdb758724247b0282210d3f5495db9a27c104a96645331c94ca6efa23
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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, which ultimately points to the URL https://irlanc.ru/square?utm_term=how+to+find+transfer+function+of+a+circuit. This suggests a phishing attack aiming to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9186

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://irlanc.ru/square?utm_term=how+to+find+transfer+function+of+a+circuit PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec965369d4b63361489923/1626117715853/fireboy_and_watergirl_among_us.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e841d22c8ac003f0dd0163/1625833938766/scan_documents_online_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8cfe9644c9b4de7f2b655/1625870313274/epic_7_best_way_to_farm_gold.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60eccc1d9f88ea4de3336167/1626131485558/i_was_affected.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7d3745c13cc4fedea9642/1625805684523/count_nouns_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_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 10600 bytes
SHA-256: b16fdf2233df378a185116685947a1725f948cfb9a0453c8bfc8ebdf5f51279b
font_01_sfnt_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 16160 bytes
SHA-256: cb22ebc126396652e33f37c556b2b87e48dc94693fe4e8c30216245f56503ad3
font_02_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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