Malicious PDF — malware analysis report

Static analysis result for SHA-256 b752cfa82eb2b203…

MALICIOUS

PDF

87.3 KB Created: 2021-07-12 19:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 218d170c4341b2bfbab0858f70779edc SHA-1: 5ca587b191d1825a2df15d630528b1b691d9869e SHA-256: b752cfa82eb2b203d45d039e2235539754f5bf9f5c0ca5a9ac39be09f90158e5
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URL that functions as an SEO redirector, identified as a lure for free-download phishing. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification also flagged it as malicious. The primary attack vector appears to be directing users to a potentially malicious site via a deceptive link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6359

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://feedproxy.google.com/~r/razvivatel/yapz/~3/gOBB6uaVNRA/square?utm_term=american+english+examples PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8134d25441e1b37882c60/1625822029805/9094746740.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7357288cf71862a7e7cd/1626108759157/95306625300.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec705d2de9850677715d48/1626107997493/kuganiwugedoxufe.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_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 17104 bytes
SHA-256: 6a153083d4d1ef69bcde2cbd16666904cfbe90df424b15fe2dc6f1130f3839f4
font_01_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 10688 bytes
SHA-256: cae36f0fd3086925e6eafcd535a425c51e8c99e21454d8dbb1cd1d95dbf3cea5
font_02_sfnt_off00013970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1