Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d38c5389bcb52e…

MALICIOUS

PDF

82.0 KB Created: 2021-04-06 03:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 30854bbad29ccd5ba6447544ab0e429d SHA-1: c7e2f528be5d200e8de75b95003bf4920d6b03fb SHA-256: 40d38c5389bcb52e5d72c8c1056a5f2fb0bf28e4d12f4b49dec1af75c8379c83
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm with 30 external links, many pointing to disposable hosting, and one specific URL 'https://soxebez.ru/strik?utm_term=que+es+el+servicio+de+alimentos+y+bebidas' is identified as a potential phishing or malware distribution point. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/strik?utm_term=que+es+el+servicio+de+alimentos+y+bebidas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407562/normal_5fdf58511c9d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5ff77b513809a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5feb3309cb3b1.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/angiotensin_converting_enzyme_inhibitors_davis.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/ottoman_empire_history_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490722/normal_600387635ed23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418970/normal_5fc6719d4a02a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494663/normal_60381f40f08c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_60103708f05b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_c7d0c341cb214e45a2c64e0541ff507d.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_156f000602814e34a5479be6101d1d85.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_c8cfbb08d42a42b88e5d8713fc65ae90.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_797f9be4089944c1854c5af96c6c36fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb14394-b554-47b8-a0ef-5f545a2ad07a/how_to_descale_my_2.0_keurig.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_64da1dbb929148c4a321bee3c89b3e7e.pdf?index=trueIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_120494ef5772476ab503d69ac0e4d609.pdf?index=trueIn PDF document text
    • http://jasesazolaf.myartsonline.com/21320042716.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_19e94161287e430c9207964a23613943.pdf?index=trueIn PDF document text
    • https://7920a853-f458-4dfc-a893-f50c3ed6f780.filesusr.com/ugd/fe7850_b34ae1cd59db4c8cb5888206be49ff1a.pdf?index=trueIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_ca89244ca40b4e0dbe06efa5883dd912.pdf?index=trueIn PDF document text
    • http://tipokeviti.atwebpages.com/american_english_file_2_second_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc54fea-9cd5-4c7f-a286-dd7c6fcbadd2/best_books_on_the_art_of_manipulation.pdfIn PDF document text
    • http://guseboses.atwebpages.com/xewezapavolevudirupabonu.pdfIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_30c92592e69442fba15d2e04709663b7.pdf?index=trueIn 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_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 5448 bytes
SHA-256: 104ef7c4ae6f8ca5ef4ad55564f70c233b82e77e9ff108279717b24f08c0fa44
font_01_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 11668 bytes
SHA-256: 73fb7e4631b7417e60a6e78410128ecce3cd411933f50081084e9dac7cf32a1a