Malicious PDF — malware analysis report

Static analysis result for SHA-256 87972c56163d64f0…

MALICIOUS

PDF

85.6 KB Created: 2021-03-14 11:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4b7ea1ad1b83014c72c7ef7f39029955 SHA-1: 4dff91819c6f9c34db757c3c7b17b62a47bb6e63 SHA-256: 87972c56163d64f0d2f8d25df2e39d09f39697a0bedadaa979325f621dcf1c34
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It utilizes a link farm with multiple disposable hosts to obscure the ultimate destination, disguised as a free download for Excel formulas. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://leonvi.ru/strik?utm_term=microsoft+excel+2016+formulas+list+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/jebozibiru/hcjiVgf/wamonuxova.pdfIn PDF document text
    • http://lolegig.22web.org/nogenij.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/y7ohahc/topps_champions_league_2018_19_sticker_nachbestellen.pdfIn PDF document text
    • http://abwaab.su/cv_template_word_gratis_enzv2cg.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/cBOdAfd/the_farmhouse_tap_grill_burlington_vt_05401.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/jjHUOja/bonafezipawijuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/fzVihhf/castle_crashers_2_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465264/normal_6035837f966e7.pdfIn PDF document text
    • http://luminar2-download.xyz/ipega_bluetooth_controller_iphone_setupmtflu.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/6RVP5jc/31604069120.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/whj1Bii/6861619952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_5fd9bb8a179b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444092/normal_5fdea150c851c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2d5b176d-dc4c-4ec6-8277-6289f6b4378b/40914727049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a8eb17-3ae5-4929-9b28-d1e52dc459be/75473002924.pdfIn PDF document text
    • http://nivosifif.rf.gd/a_discovery_of_witches_where_to_watch_season_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7fd2d7b-b4af-4882-b1c6-879a6c177a22/ridulowanepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2678aa9e-4846-4c01-adad-17882d228fbd/verizon_ont_i-211m-l_reset_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e72d694a-324d-45ac-ae6c-548121345815/introductory_econometrics_with_applications_ramanathan.pdfIn PDF document text
    • http://pinojes.epizy.com/92530877356.pdfIn PDF document text
    • http://vofefigekoloru.epizy.com/dyslexic_studeos_pathfinder_character_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10013 5828 bytes
SHA-256: ec54be25cdb4663fd8c251ae175cf72039282e4b75d7978bf8523f129a846365
font_01_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 11328 bytes
SHA-256: 8ff13794f1ee5f3be6ca7b7066306a8dd054612d6e368d75aee9fd83b384c00d
font_02_sfnt_off00013a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A83 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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