Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7305fd7439f3ce…

MALICIOUS

PDF

94.8 KB Created: 2021-03-18 03:18:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ca858cab62bfc97ef5068c666f8a60e SHA-1: 5110809d449f75edcfe8986c998d5497c125343b SHA-256: 2a7305fd7439f3cea4c95dbc0ad51aeed42d051dac39f78071900323d9a564c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDF files, indicating a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=vegetarian+flavor+bible+pdf
    • https://cdn.sqhk.co/wekajibex/gihhhfy/74886732960.pdf
    • http://durowan.sportsontheweb.net/google_academico_brasil.pdf
    • https://static.s123-cdn-static.com/uploads/4485309/normal_600330b7d51f5.pdf
    • https://cdn.sqhk.co/melipetoluf/hqidF9M/20549525171.pdf
    • http://nigemutekilum.mypressonline.com/occupational_safety_and_health_administration_osha.pdf
    • http://dalosizofovabes.medianewsonline.com/the_gift_of_the_magi_commonlit_assessment_answers.pdf
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/4077927.pdf
    • https://cdn-cms.f-static.net/uploads/4450907/normal_603196015f1e2.pdf
    • https://cdn.sqhk.co/tezofugowura/aBtgfih/52580366954.pdf
    • https://cdn-cms.f-static.net/uploads/4461505/normal_60501d6a01e15.pdf
    • https://cdn.sqhk.co/sunomedude/ijgfD2o/savomidebalifevinukepi.pdf
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/gizajoxatoninis_rixademe_dotarineziwelu.pdf
    • http://vizexibidoxi.getenjoyment.net/political_science_book_11th_class_ncert.pdf
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/b21593c8839ddfb.pdf
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/jabaza.pdf
    • https://cdn.sqhk.co/wujejelot/egchaLs/average_monthly_premium_for_car_insurance.pdf
    • https://cdn-cms.f-static.net/uploads/4454301/normal_6046730b660ae.pdf
    • https://cdn.sqhk.co/xoxamomajil/jcgcFY1/beach_buggy_racing.pdf
    • https://cdn.sqhk.co/tinulafi/jfeOja4/softball_questions_and_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://segurixuzek.myartsonline.com/dunugukurijoxisenex.pdf
    • http://wuragumok.atwebpages.com/78834469811.pdf
    • http://ketabigumowun.atwebpages.com/guxinudamekalafami.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133d2.bin
a0a07de9dc68f5aa23484109ac6dfc5ebac81f90c8e5976666a2bb81e0202a01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133D2 5196 bytes
font_01_sfnt_off0001459a.bin
93193a4d85d09693006d2a69bee4ee36ac46f7a016f4021d0889cc64deb58186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1459A 11916 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.