Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bdeba9fd74bd29…

MALICIOUS

PDF

76.9 KB Created: 2021-05-19 04:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7537780af5d79c00ffc456adb5686a3d SHA-1: c47fdad786d00de93ce57bd01a55f5e263b74fc5 SHA-256: 26bdeba9fd74bd295354e5b582b30d56e0666a6af8744db901fa7b24ffa05437
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to what appears to be an SEO link farm designed to redirect users. The primary lure, 'How to convert jpg to cdr in photoshop', is presented via a link to a redirector URL. This suggests a phishing or malware distribution scheme, likely involving a macro or exploit within the PDF itself to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=how+to+convert+jpg+to+cdr+in+photoshop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465128/normal_5fe9291220363.pdfIn PDF document text
    • https://visoruze.weebly.com/uploads/1/3/4/1/134109001/4514331.pdfIn PDF document text
    • https://gifalixes.weebly.com/uploads/1/3/4/5/134593917/samiga_zegavemagado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385614/normal_5fe0756ff21c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490735/normal_606e9e7c08ec5.pdfIn PDF document text
    • https://vakevugulipew.weebly.com/uploads/1/3/4/5/134507067/1908085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477886/normal_603e9f7d7c073.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paxunu/consumer_reports_magazine_october_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/date_format_iso_8601_shell.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/pupetatubaxizipugadeb.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/evh_5150_combo_review.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/french_adjectives_worksheets_for_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/merit_badge_college_2021_delmarva.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/wipuwaj.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/zasafizugexaguki.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/oxigen_wallet_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/get_page_content_wordpress_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/troy_bilt_tb200_engine.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/baaghi_bhojpuri_full_hd_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/ccc_information_services_address.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 5284 bytes
SHA-256: 120d67748a3e2cbf0d53361d82c7abd49343acbc9cd77cfc2c4f71c5a5407608
font_01_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 10440 bytes
SHA-256: c1a8332268babf30788b01036060ab5ef500fd90ec5b96e4fcf19dccb1673b8e

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