Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03605b4d828ead2…

MALICIOUS

PDF

91.3 KB Created: 2021-07-13 18:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 722ac28e474bac9496d0b4bd3e736bc6 SHA-1: 5800ff2f1dd58c777bc880051a8e9541074ca201 SHA-256: a03605b4d828ead217e3a4f8576d6bd5417ddada1280b1c07ba2d18983b1b0ff
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high-severity heuristic indicating it's a phishing lure with an SEO redirector. The embedded URL, https://inwebjor.ru/square?utm_term=top+10+countries+in+the+world, is the primary indicator of compromise, leading to a malicious site. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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://inwebjor.ru/square?utm_term=top+10+countries+in+the+world PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed73adc927da2a63faea83/1626174381411/70160030481.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec8b9854a52c186ce5d792/1626114968769/lebipavofunojosidugo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec9d2c0e7a3c5fba3fe434/1626119468556/83002212948.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e77931860dc56574a36a2d/1625782578029/pifozas.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8665765512e62108ce528/1625843287310/list_of_secretary_general_of_united_nation.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eda68fc8312e4ee1df482c/1626187407523/setogipofuluxebabugadu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e904bcb68d8f0f4bf6fa47/1625883836783/order_by_sql_alphabetical.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec932be07849485499c206/1626116908061/camp_piney_trails.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_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 16612 bytes
SHA-256: c04b4042eeeea5ab7b5f73edebdd600143357bb02d6bfd96228854de47901d56
font_01_sfnt_off00013049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 10772 bytes
SHA-256: 7052af71dd90cc1bd1b93f4b52e1fc6f0dbd0edb66f257797d422425eb457513
font_02_sfnt_off0001491a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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