Malicious PDF — malware analysis report

Static analysis result for SHA-256 de320e40c64d4929…

MALICIOUS

PDF

78.4 KB Created: 2021-07-12 21:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6d12e0bf417edf68d3d27d0fad8cfeb1 SHA-1: bdbc07d1229ada1a3f144bfb329fe7b8851bc8f8 SHA-256: de320e40c64d49290c6922dce9af4d8215973d9ae48800989fad825b0c29cfd2
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified an external URI and an SEO redirector link, specifically pointing to 'https://garglob.ru/square?utm_term=how+to+find+the+equation+of+a+parabola+with+x+intercepts+and+a+point', which is indicative of a phishing lure. The document body was unreadable, but the presence of these indicators strongly suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8134

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://garglob.ru/square?utm_term=how+to+find+the+equation+of+a+parabola+with+x+intercepts+and+a+point PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e931b483ae0c490239a9c9/1625895348543/tuladiwofavifadimuzaf.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec864ef89f8e700bf7b153/1626113614795/31224782355.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8d240c158db2a32daa638/1625870912171/balofi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8be61b009f83b0754f09d/1625865825444/ark_cooked_fish_meat.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8d9dcd1a1204f6c8deed/1626115485843/85422925531.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_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 11284 bytes
SHA-256: 597b84bc117ae139b8e99eaaea327cbc1e8f506e05ab6abd3827a43a082f6f14
font_02_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 17148 bytes
SHA-256: e16ee194e9b6cae2162a4b6b1da4bef1ec286755631cb89369f46cf4829c5925

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