Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8ad740e413193b…

MALICIOUS

PDF

80.5 KB Created: 2021-02-23 23:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ea46827de974f5daf85808e7c6188bb0 SHA-1: 18831491b70fde4a56c7ec7fcff95b5e8f9c8632 SHA-256: 5a8ad740e413193bde2d995430a77dc8ccad36a05433bed3a90670e1b6bd1fa7
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to external PDF files, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is weaponized to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/strik?utm_term=the+little+prince+book+pdf In PDF document text
    • http://republvinb.fun/prince_sultan_armed_forces_hospital_madinah_reviewsqndqj.pdfIn PDF document text
    • http://servisvds.ru/download_the_last_airbender_2_full_movieqz4j5.pdfIn PDF document text
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/bewatofotewaxo_padusukes_xiniji_zosizidubap.pdfIn PDF document text
    • http://bupro.asia/joditibilevetutosimebw05e.pdfIn PDF document text
    • https://zopokirupinurow.weebly.com/uploads/1/3/1/3/131381130/23651.pdfIn PDF document text
    • https://sanakutubifave.weebly.com/uploads/1/3/4/8/134849958/ee22240c1.pdfIn PDF document text
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/37491b9060.pdfIn PDF document text
    • http://padlamadla.site/debrider_baofeng_uv-_5rveftl.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://s3.amazonaws.com/pizexopenaxu/mayflash_f500_template.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/bituthene_primer_s2_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/fivinabil.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/minimalismo_musicale.pdfIn PDF document text
    • http://muwojes.epizy.com/indices_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/full_hd_movie_kabir_singh_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/debufonepopugolovubino.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/top_10_offline_high_graphics_android_games.pdfIn PDF document text
    • http://gafigap.epizy.com/comparative_and_superlative_worksheets_ks2.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_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 4796 bytes
SHA-256: 3b0af6dabad866c55d7a425d69d7caa79f77508122fb961b3ef66856553b060f
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 10584 bytes
SHA-256: 0f1930f78d9e0eebf77485eae6e7ab03a005cd034341d13c3862548cb63107d6
font_02_sfnt_off0001271a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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