Malicious PDF — malware analysis report

Static analysis result for SHA-256 a886b55fc25d8fae…

MALICIOUS

PDF

96.2 KB Created: 2021-07-20 08:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9dbc7e25d2f10a4e8150768e34f81647 SHA-1: d54bf3f4b388ee2359b6dcd97984daf18def6265 SHA-256: a886b55fc25d8fae0b903b4323805f078c5a6c23a8b4ace3daa70129e0636735
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a link. The primary URL identified is a Google Feedproxy link, which is often used for SEO manipulation and redirects to a Squarespace hosted PDF. ClamAV also detected this file as a phishing trojan. No scripts were extracted, but the overall pattern suggests a phishing attempt to trick users into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6471

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/sq/ugae/~3/mHcMeCcfVl0/square?utm_term=crowfeather%27s+trial+pdf+download PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f1ece7c3951174706c3d6b/1626467559419/tenitil.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edaef658c2e0009562df16/1626189558301/98740855719.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f64eacd7d722325d7697d9/1626754733151/national_geographic_answer_book_10_001_fast_facts_about_our_world.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecb615a9a8dd5e31c870a5/1626125845480/dynamic_friction_force.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f39111bf9212646c3dc3f9/1626575121851/64690643762.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f09ccbd4c6c521fcc2ac0e/1626381515625/newton_laws_worksheet_with_answers.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 16284 bytes
SHA-256: e71cd16be399542f71640728e23792d0816d04d7578d36ecd79c4961e6fd505d
font_02_sfnt_off00014e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2A 2840 bytes
SHA-256: b5f28de6127f04903a04c4e537ad0981289f28177aef2013e5ce3b205c657585
font_03_sfnt_off000159d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D5 10748 bytes
SHA-256: 55f854ce5c056fac8d9968d564ad387cbf9378202bfaa55a132ddfb94a388481

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