Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a8d77c028bc5cb…

MALICIOUS

PDF

73.9 KB Created: 2021-07-12 20:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 84dce455c8138a7a4452a26eb331d900 SHA-1: 1beef5974fec4eba1df0a4741d3eadbf48987a69 SHA-256: 04a8d77c028bc5cbe4d72e18320d548fa6eaf0e9a8ef7006a46ea744f2d117cb
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The high-risk heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates an image lure pointing to a redirector URL, which is a common phishing tactic. The embedded URL leads to a suspicious domain, likely serving as the phishing landing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7218

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/square?utm_term=3+letter+word+beginning+with+x PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec79fedcef4a49b3a9daa9/1626110462212/14550294152.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e90ebf2210ba6bce116b24/1625886399262/sudagatepojorada.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec77ada1f8f93f64aa94ce/1626109869877/your_strength_is_inspiring.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7727288cf71862a84615/1626109735832/2919444266.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_off0000c127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 10600 bytes
SHA-256: 2224e431d457c75a2ef682253f601103a252781e7f8018ad5b69f595a6b21b64
font_02_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 16644 bytes
SHA-256: 1d4e4d0f303ff59fe2ee2b41560c6778bd1be803ab40f1d518a7b4d00cdeb6a2

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