Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1af2880b25b4fc3…

MALICIOUS

PDF

81.8 KB Created: 2021-07-13 21:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ef95d06d70dd470c947a04b5390f7df5 SHA-1: 36c59ff8532e0a468843e056b90e650886108bf5 SHA-256: f1af2880b25b4fc3c1310f1dca3fea476cebfd0c56f929a89f53e3cbd6e1f24e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic indicating an image lure linking to an SEO redirector, identified as a free-download phishing attempt. The primary malicious URL, https://cructi.ru/square?utm_term=homer+the+smithers, is embedded within the document. While no scripts were explicitly extracted, the PDF structure and the nature of the URL suggest an attempt to trick the user into visiting a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8365

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://cructi.ru/square?utm_term=homer+the+smithers PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed935503cb9e0b59782bf0/1626182485776/79079212549.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8b1fd3f17e32e5604a348/1625862653305/chinese_annexation_of_tibet.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eda8ead2d00a35b8d15521/1626188010355/fonatowujamapajibatudol.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edd090cb43530604a67410/1626198161033/fortnite_lite_android_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e84d9b3ad3040a268b0a5a/1625836955199/8214742022.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_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 10052 bytes
SHA-256: 3d55de75ca057feeecea9f3b33fac25839b947590785d79a84795add84b914ca
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16988 bytes
SHA-256: 5bdb45cd31a3e02bcca1db73b8e56f71a8d4f81c628d28167163452ce2e4ed4d
font_02_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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