Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef573825695327d…

MALICIOUS

PDF

82.3 KB Created: 2021-07-13 14:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f11711fa5a2c8886123ee10be5ee41d8 SHA-1: 97e454098fefe9a020b56b1f48f6890a8be4454b SHA-256: bef573825695327db0b43d07cd6077de4d58bb220dba13d97114e68d796dd20c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a 'PDF_SEO_UTM_REDIRECTOR_LINK' indicating a phishing lure. The embedded URL 'https://philabc.ru/square?utm_term=quotient+rule+with+trig+functions' is identified as a redirector. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The combination of these indicators strongly suggests a phishing attack delivered via a malicious PDF attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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://philabc.ru/square?utm_term=quotient+rule+with+trig+functions PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8e346b630645a0ef430ad/1625875270465/225_pounds_in_kg.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e9367cf4fe78435a3b7f80/1625896572685/depinagutejukago.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e80fbfa3609a707bae3ec4/1625821119703/99034111050.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ecf26bf95b5524f94d8aa9/1626141291618/kadelafegoxoso.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8cf7840fa0f2168471397/1625870200530/3183667183.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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 18932 bytes
SHA-256: c1deb4aef318e1d60fc5a98ed83f016c291e040f5a59a40e93024a4dfd9a4722
font_01_sfnt_off00010c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001249a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 10696 bytes
SHA-256: 4ff39beefbd9e019078d38a12ef731d75a004f312a42eebcce8c9a0fc69f058c

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