Malicious PDF — malware analysis report

Static analysis result for SHA-256 963be0aace5a9018…

MALICIOUS

PDF

103.5 KB Created: 2021-07-12 23:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1a450d2a408e29a7bba0d9853ff92058 SHA-1: 0aaa1e179cce67b43a135637458f0976741c38ed SHA-256: 963be0aace5a9018869661135db07a8498c053b432d9df83de43651302bf5a2d
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a high-severity heuristic indicating it's an SEO redirector link, specifically designed as a phishing lure for free downloads. The primary IOC is the redirector URL, which is likely used to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5412

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://garglob.ru/square?utm_term=rusty+spotted+cat+diet PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e9085c566ded7d61abcfc8/1625884764691/wuvirijumubipoloragepure.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8d5111651423cab5f1adf/1625871633480/rare_phobias_in_the_world.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e861defa333328a7b982/1625876577138/strike_the_blood_episode_1_english_dubbed_kissanime.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e822cc25441e1b3788cc29/1625825997016/zurabadijiwaxobagaje.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_off00013324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B36 18248 bytes
SHA-256: 3883724f68102fe6eeafcb36029af8caf30c97614df91111c37a8f832cf13ccd
font_02_sfnt_off00017a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A4C 10516 bytes
SHA-256: f733f02616d360aa74da0098521925c6375d1c42c41cbe401246594c8923bbcf