Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b91876e1b42d641…

MALICIOUS

PDF

70.7 KB Created: 2021-03-08 17:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 913ac934110ae6c056fd0cff9bbd4f77 SHA-1: 5b2ef8d20fe442bad3e95f1b23635683d513feb1 SHA-256: 6b91876e1b42d64194d8d0d15418fe40589b7f87701bf87e096095318a658dae
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, which likely leads to further malicious activity or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/award?keyword=advantages+and+disadvantages+of+social+media+for+students+pdf In PDF document text
    • http://kukushpa.fun/fomojobujabofawiraxututanebo3s.pdfIn PDF document text
    • http://honey-love.ru/90203976817xcr0o.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/biwasuxogajin69nop.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/lrhficX/free_math_worksheets_converting_fractions_to_decimals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_5fdaab713c143.pdfIn PDF document text
    • https://cdn.sqhk.co/lawipavoso/ibuFjhM/rojumaxokexam.pdfIn PDF document text
    • http://sdfafq.info/what_is_the_definition_of_the_word_sephiroth163vx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454184/normal_601cccdc5eb2e.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/18272173750p3wr0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_6045bc1434aeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403823/normal_5fffc255408b6.pdfIn PDF document text
    • http://peskomment.ru/what_are_the_best_sauces_at_buffalo_wild_wingsqdgnp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_6011255e1999f.pdfIn PDF document text
    • http://kmplitka.shop/manhattan_prep_gre_set_of_8_strategy_guides_manhattan_prep_gre_strategy_guides_paperbackfwet4.pdfIn PDF document text
    • http://goossyy.online/253063755714wu3o.pdfIn PDF document text
    • http://contact-git.top/jawujinapulagozo2jee6.pdfIn PDF document text
    • http://sungo1.space/vovigojerig6lhos.pdfIn PDF document text
    • http://bluebadgeapproval.com/arduino_projects_for_beginners_in_tamil3wxyb.pdfIn PDF document text
    • http://storeyou.store/honda_gcv190_pressure_washer_3000_psi_water_pumpssd5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 5524 bytes
SHA-256: de563ec2f97038a697cb38c3c4a8a403405f3454d178882a8ec46a5aca7dcbd8
font_01_sfnt_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 9852 bytes
SHA-256: 4fef56eac8443f6df7b2f89377292c50b7196b25ebbb4b9da482b5f09c2d744a

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