Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc3e3c35d94a423…

MALICIOUS

PDF

180.7 KB Created: 2021-07-13 19:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d186777ef4dcc61ed78db9c426980d97 SHA-1: efbb058e015579510d40784018b546b3dce4ff8d SHA-256: 0dc3e3c35d94a423244b996b59f8350161e3d5fb330f3d691b12ea84ab04855c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic indicating it's an image lure linking to an SEO redirector, designed for free-download phishing. The embedded URL, https://queure.ru/square?utm_term=facilities+planning+4th+edition+solution+manual+pdf, is the primary indicator of this malicious activity. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5434

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://queure.ru/square?utm_term=facilities+planning+4th+edition+solution+manual+pdf PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed98974325c5343bb93d29/1626183831759/korozeponokivumulubo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e91449854c1d3b34867f8c/1625887818122/buzile.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e949943ba7d954d54759dc/1625901460278/vexadeferubivaf.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e90ea06e267257943a2239/1625886368342/gifebov.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e95c593ba7d954d547d9af/1625906265441/67954252513.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_off00025fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25FCF 19064 bytes
SHA-256: 9eb408747191f10a3abe63c77aa9e802a021f5eeec051ba57ccda1b4c402d007
font_01_sfnt_off000292a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x292A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002aaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AABA 11124 bytes
SHA-256: 74cc71c8a8aeb16aee639c6aa4b6a558f6dcdaf9da849cb49e02d5c53f203871