Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e29f1ba32161181…

MALICIOUS

PDF

72.6 KB Created: 2020-12-17 18:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6615c823491103ca4c00db9de9a8a43f SHA-1: 921202086020ffa7a15a496f8ead5970e80e4954 SHA-256: 3e29f1ba32161181c71d09ec304ac0974f5bd6a9b97bdff57ba893f139789b28
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://traffine.ru/strik?utm_term=9-1+graphing+quadratic+functions+answer+key'. This URL is presented as educational material, likely a lure for phishing. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', further confirming its malicious nature. The ML classifier output of 0.999745 strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://traffine.ru/strik?utm_term=9-1+graphing+quadratic+functions+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f8f916b3cbbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413113/normal_5f9d9d1688c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_5fbb160f20190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5f9574498e794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f9ba7593ce57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5fd0ff05e016a.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/febopa/asymptotes_common_core_algebra_2_homework_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc31bda-dc13-45a7-bcaa-1bebd5f8376f/funciones_exponenciales_y_logaritmic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b7f4ade-be41-4420-a427-58a85d32babe/a_decada_de_1980_foi_dominada_pela_inflao_e_pelo_desequilibrio.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/tom_sawyer_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/hevenu_shalom_aleichem_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0aea4c-bbba-401b-978f-87794bc107b7/the_morning_meeting_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/gmx_sign_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01acbe9-b028-46e1-b7ec-defc6bc70c98/jalebirabes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc8d9a3-866a-406a-9f7b-cc4d3b7b4ec7/cheat_database_download.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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 5912 bytes
SHA-256: d6f73a008b0158f24f6bee9e501910ca0eccbecf7a33b4ad8a08958f4941ae32
font_01_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 11272 bytes
SHA-256: c222a48e8d47ad9e0218b720e23a3ccb265ff7ee74b94bc9d166a2e533f71368

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