Malicious PDF — malware analysis report

Static analysis result for SHA-256 343f9b83aaeb2697…

MALICIOUS

PDF

82.3 KB Created: 2021-05-23 18:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 41962987f9d9c69d56d32882c877eb18 SHA-1: b8cab5e132fa1d468a8aafac6bdea15a2a43bd07 SHA-256: 343f9b83aaeb2697574233e6262ad6883805761acfd30f4c655a5e9a7d9da134
154 Risk Score

Malware Insights

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

The file is a PDF containing a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The embedded URL, 'https://yafferge.ru/strik?utm_term=astrological+charts+pro+apk+free+download', is presented as a download for 'Astrological charts pro apk free download', indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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.
  • 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://yafferge.ru/strik?utm_term=astrological+charts+pro+apk+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4487641/normal_6024958c18497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_5fe9c4097acea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408873/normal_60582ab51151a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376602/normal_5fecc3443c0a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410214/normal_5fcf32fb7f3bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/regovadeje/tikopawisuwapam.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/25502605769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9a1fbc-4b8e-4e9f-9cf7-6c930254ac14/lobogokojesupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc2372b-6267-45d2-a298-b0e0784ec5cf/33355992676.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/mofomosugomijibebobuwewo.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/aufgaben_performance_marketing_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888a4494-7487-43d7-926b-474ebed0849f/saber_cuanto_debo_de_mi_credito_fonacot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f771558-0a85-4906-a5ab-f0454a7de21a/74024338679.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/60163973529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0af8938-1f2c-43cf-8cf9-ae9672d7d87a/rakavobuduliwab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460b1ac8-e85a-409d-affd-5f3f5937bd61/16536036010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbcbc8a3-cc23-460d-a6b2-44826080083b/fisher_scientific_isotemp_explosion-proof_refrigerator_freezers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ee41e5-7140-4e38-b929-7b8cd1e22731/power_pressure_cooker_xl_used.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/mimelimitemejife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e19a8f-6e3c-4ed6-8b04-b54e3f0f256d/22168330105.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/preparing_for_acs_exam_in_organic_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d65c87-5c5a-4cba-8439-d64d89a2cf10/maus_by_art_spiegelman_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6aa0218-4f2e-4c6f-a814-b150e14b0430/how_to_get_a_senior_drivers_license_ny.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 5564 bytes
SHA-256: bb62f6a6a785c524d1d4108574e8bcc7882f0aec6555724d4e99308e2d4873b4
font_01_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 10844 bytes
SHA-256: b18ff359fb13794e9d53684f98fb67615b7e464a2e696a4d0401213b54b7cb1e
font_02_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073