Malicious PDF — malware analysis report

Static analysis result for SHA-256 da01c50b21120684…

MALICIOUS

PDF

84.3 KB Created: 2021-03-26 09:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 797c221354dca6cc852b4ff4ffb8fbb3 SHA-1: 4265feda5dd0a8ac9615564f9251a15cfd7bdbda SHA-256: da01c50b21120684b1bcb3bfb13d1726b084fd25b8dd7826b2f259dea6eba49e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or SEO manipulation scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jacksth.ru/wix?keyword=in+the+heat+of+the+night+chapter+6+questions+and+answers PDF link annotation
    • http://peromopativej.mypressonline.com/bsc_maths_book_1st_year.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5fcc60f0c1d70.pdfIn PDF document text
    • https://xuvifadeto.weebly.com/uploads/1/3/2/6/132682806/jonix.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/wutukurowegelob.pdfIn PDF document text
    • https://varepanuror.weebly.com/uploads/1/3/5/3/135394497/favazesutewikip.pdfIn PDF document text
    • http://pedalini.club/pirepifuramjtq.pdfIn PDF document text
    • http://lenugaguv.medianewsonline.com/best_definition_of_artificial_intelligence.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412582/normal_5ffecef97de89.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/gokupafofokegidomi.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/cognitive_behavioral_therapy_book.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/24011938880.pdfIn PDF document text
    • https://gasomuvujutomeb.weebly.com/uploads/1/3/4/3/134356107/vikopafa.pdfIn PDF document text
    • http://legiontry.online/telehealth_services_in_spanishkyflg.pdfIn PDF document text
    • http://interbank.link/what_is_data_warehouse_and_data_martq6m3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_60417236bea68.pdfIn PDF document text
    • http://money-team.site/38743812790dc9iy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5febf7eff0f67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478383/normal_60087dd0c7c48.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/wivudak.pdfIn PDF document text
    • http://mavixepajifulem.scienceontheweb.net/11911595224.pdfIn PDF document text
    • https://tirusagoxavux.weebly.com/uploads/1/3/5/3/135329940/walakus_fubar_mositusugax.pdfIn PDF document text
    • http://susurrus.space/4._6_cpctc_worksheet_answers_geometry9gz4q.pdfIn PDF document text
    • http://rankingcoach-seo.com/pamurizegunosijagidinexedulwq6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://manuwakagekewu.onlinewebshop.net/66685125963.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/25771407165.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/mifajexadeto.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_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 5696 bytes
SHA-256: 5597decb603d98b48fe29c0763d82c20038b80858f2db297ec714f81d80e8383
font_01_sfnt_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 10592 bytes
SHA-256: a52421117233a9bfea1ec7237fba74a252c01049c1c3c6a72e89a14dd518b00b

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