Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e142ec73750fe5…

MALICIOUS

PDF

75.2 KB Created: 2021-05-24 14:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 52da28efa13defef7ceba80d70940f5c SHA-1: e35993da03eb3519930b49367bc02094d5ede215 SHA-256: f3e142ec73750fe5de59322dd795cfda40997119d7007c080edae6d015cbda3a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URLs, 'https://resalured.ru/strik?utm_term=biologia+y+geologia+3+eso+oxford+inicia+dual', is flagged as unknown reputation and is likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • 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://resalured.ru/strik?utm_term=biologia+y+geologia+3+eso+oxford+inicia+dual PDF link annotation
    • https://waxuxugiw.weebly.com/uploads/1/3/5/3/135312989/sokogaxaxenojoxaxin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451954/normal_6005ba85eafc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_604e96e3287ac.pdfIn PDF document text
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/2440202.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd18406-ad34-4c8a-a7d2-b55266c170ce/xasinido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d2d0fe-da33-4248-9e1a-c1d58acfe647/xegovizadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9d208e-1925-4143-8ac0-04078a68bdd0/tofukimubujedo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/mobile_games_statistics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff0dae4-aa96-41af-88c5-24a5ff54ec6c/farizesakoresu.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/94251841310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285db9bc-153a-450a-adb7-b353d7932d76/yogasana_books_in_kannada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23817b34-8c4d-4b8b-8fcb-a0e49af4d081/hands_of_light_massage_therapy_coos_bay_or.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81108601-64c5-4b5e-a6eb-98fdaf9b3e4c/black_diamond_headlamp_battery_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc42597-9aa2-4390-a589-41fab68fbf46/panowugidex.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/dawuwabemokobowetalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff05899-cdce-4a27-86b4-a7dcd7ef1800/mongoose_traveller_high_guard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72cd7e6-a0aa-4eaa-a639-eb36cd4efdaf/clean_code_a_handbook_of_agile_software_craftsmanship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df85a6aa-01e4-49f0-a2f3-41462fb2e032/shoprider_mobility_scooter_parts.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_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 5572 bytes
SHA-256: 0c561ba7fb9039e6809984da59e61e61b6777928f1b0f4bacbd3276168311852
font_01_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 11524 bytes
SHA-256: d5e918ebafc6472cf8699593a4674dc4df602b24f00a4bcfebf881439b1648c1

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