Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e9cbe5d1839398…

MALICIOUS

PDF

114.1 KB Created: 2021-07-12 21:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f14a647fe4dda6e00ceb658d54cb69af SHA-1: 964d67df0c5623e31d6deab3c5e973a93b6ed785 SHA-256: f3e9cbe5d183939803f3218a3fd30aed76db6ca6f64f1beddbca78459201ee44
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. A high-severity heuristic identified an image lure linking to an SEO redirector, suggesting a phishing attempt. The embedded URL, while marked as confirmed benign, is part of the redirector chain. No scripts were extracted, but the overall structure and heuristics point to a phishing lure designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5909

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://feedproxy.google.com/~r/razvivatel/yapz/~3/v-xubMviL4Y/square?utm_term=subatomic+particles+list+in+order+of+discovery PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e95a900a287971af9b9bf0/1625905808365/27847317467.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec880c5c244202458bd1db/1626114060127/pre_and_postprandial_glucose_levels.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e381db8bb141bad624dc/1625875329566/kijerivitujalelobabe.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e87c1db0d761638332a625/1625848862091/wuvetuvusotazetoz.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_off000158d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D9 18644 bytes
SHA-256: 668c30df3e7c348e998940ae51020da32ac3afaced51310ee77dec96cf95ff1c
font_01_sfnt_off00018a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A261 11276 bytes
SHA-256: e233b969786fe2826c2ac2d2f7aeb0258760503a7cdb3874b696ebacd19e7fb9

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