Malicious PDF — malware analysis report

Static analysis result for SHA-256 70dee33978a92fcd…

MALICIOUS

PDF

82.0 KB Created: 2021-03-14 06:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 413668c50181d2013858de608dadf8f1 SHA-1: 4ccb1d7e825a1113bd55acacec69f61786453f9f SHA-256: 70dee33978a92fcdf102007251680bd61e355c6cf9bb2634757bacc8808fb4b7
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to scholarship essays, aiming to trick users into clicking the malicious link. The ML classifier and ClamAV also strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://dafemum.ru/strik?utm_term=how+to+write+a+high+school+scholarship+essay In PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/baxunivowi.pdfIn PDF document text
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/mikosututuserat.pdfIn PDF document text
    • http://kleomaften.online/purexeviz1cnl.pdfIn PDF document text
    • http://detonic-de.website/mozunuzaxunitewoc5zyo.pdfIn PDF document text
    • http://kengoru.space/alapana_christian_songsirat5.pdfIn PDF document text
    • https://rowaxomizubo.weebly.com/uploads/1/3/2/3/132302787/bojawo-maxiwo.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/corporate_social_responsibility_and_stakeholders.pdfIn PDF document text
    • http://sfr-espace.best/afro_samurai_game_apk8brgh.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/data_analysis_tutorial_for_beginners0djlw.pdfIn PDF document text
    • https://beponuju.weebly.com/uploads/1/3/4/6/134626977/lutobad.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/fidonakopotuxa.pdfIn PDF document text
    • https://gapikedezasede.weebly.com/uploads/1/3/1/4/131438622/626d0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fakesux.epizy.com/xepagametogugusik.pdfIn PDF document text
    • http://tulixiwubov.epizy.com/life_of_frederick_douglass_quotes.pdfIn PDF document text
    • http://fukemasun.epizy.com/33577997502.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/barbary_coast_trail_guide.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_af8babbf1f114dcda347c9f73021575d.pdf?index=trueIn PDF document text
    • http://gometupibi.rf.gd/jifibelak.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_2840b59f88b54491a1dc5ac6e7a4c086.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_0511b72fabaf4ffe92d614b7a56109d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/small_business_management_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/eigenvalues_and_eigenvectors_questions_and_answers.pdfIn PDF document text
    • http://jibipadesubamom.epizy.com/how_much_does_a_24_month_old_talk.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/sadlier_vocabulary_workshop_level_e_unit_5_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/weriduzolupixiwu.pdfIn PDF document text
    • http://jusopetikikij.onlinewebshop.net/gawaloresomuzo.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_d34492f238b14839ac0f3fa4cc6749ff.pdf?index=trueIn 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_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 5352 bytes
SHA-256: 3b133cfc6147054bdf69208e8eb648bc9c60e98c2e1dce80e88a6e58705c2ecd
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 10824 bytes
SHA-256: 2b8ade7bff7ace022167f17ab189df1ba928a27772cdfa5e2438f9ec730d616e